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Prof.

ONAGBESAN Okanlawon Mohammed 

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  • 2348077766064
  • onagbesanom@funaab.edu.ng

Short Profile

  • B.Sc., University of Ibadan, Ibadan, Nigeria. Sept. 1970 –June 1974
  • M.Sc., University of Edinburgh, Edinburgh, UK. Sept. 1978 – June 1979
  • Ph.D., University of Southampton, Southampton, UK. Oct. 1979 – Sept. 1983

Research Interest:

Major research interests are endocrine, paracrine and autocrine control of reproduction in farm animals, embryo physiology, adaptation physiology, incubation biology, developmental biology and gene expression profiling using molecular biology and proteomic methods. Additional interests are in the field of nutrition-reproduction interaction in farm animals.

Research Grants

  1. Agric and Food Research Council, UK. (BBSRC) 1992-1995; £72,000 (joint award with Dr MJ Peddie, Southampton University, to study the functions  in the gonads of the domestic fowl)of growth factors IGF-I, EGF, TGF
  2. British Council, Paris, 1990-1993; £12,000 including travels   (joint award with Dr M.J. Peddie, University of Southampton and Dr John Williams of INRA, Nouzilly,France)
  3. Wellcome Trust, UK; £140,000 – 1993-1996,   (joint award with Dr MJ Peddie, University of Southampton, to study the expression and activation of epidermal growth factor receptors in the developing ovary of the domestic fowl)
  4. J. Reprod Fert Ltd, UK; £57,500 –1991-1992, (To study the gene expression and functions of epidermal growth factors in the ovary of the domestic fowl)
  5. Katholeic University Research Fellowship Grant (Onderzoeksfonds), 1,840,000 BEF –1996-1998, (joint award with Professor Decuypere, KU, to study effect of nutrition on the gene expression and functioning of the IGF system in the ovary of layer chickens)
  6. Ministry of Agriculture, Belgium, 4,650,000 BEF –1997-1999, (joint award with Professor Decuypere, KU, to study the effect of growth factors and leptin on feed intake and reproduction in broiler breeder chickens).
  7. Ministry of Agric. Food and Fissheries, UK, £190, 000 –1999-2001; (joint award with Professor W Haresign) to develop appropriate minimally invasive techniques for multiple ovulation and embryo transfer in hill ewes that are maintained in harsh environments.
  8. European Community research grant (with 3 other partners in the UK {Roslin Inst}, Belgium {KUL} and France {INRA}), 450,000 Euros- 2001-2004; to study the paradoxical effects of selection for increased body weight on the depression of reproduction in broiler breeder chicken.
  9. IWT/SBO Project (funded by Ministry of Agriculture, Belgium/Industrial User Group): Euros 231,851 joint award with Professors Decuypere and Buyse:  2005 – 2009). Impact of Arabinoxylan oligosaccharides on Man and animals as prebiotics.
  10. VLIR, Belgium -University Development Cooperation for Developing Countries. (Cooperation project with University of Lome, Togo). Joint project with Professor Gbeassor (Togo), Dr Tona (Togo), Prof Decuypere (Belgium), Prof Buyse (Belgium). Euros 310,000: 2006 – 2008). Improvement of poultry production through adapted incubation and rearing management in sub-Saharan Africa.
  11. RESDEC UNAAB (Nigeria) Research Grant: Joint award with three other co-applicants. Comparative evaluation of the Physicochemical and biological effects of snail mucin and hemolymph. Value of grant: N450,000 for 2years (2009 – 2011).
  • Nigeria Federal Government Postgraduate Scholarship (M.Sc. and Ph.D.) 1978-1983
  • Nuffields Foundation Research Fellowships, UK, 1987
  • Royal Society Research Fellowships 1990-1991
  • AFRC (UK)/INRA (France) Exchange Fellowships 1991
  • Journal of Reproduction & Fertility Ltd Fellowships (1992-1993)
  • Director, CEADESE
  • Society for the Study of Fertility, UK
  • Society for Endocrinology, UK
  • British Poultry Science Association
  • Growth Factors Group, UK
  • Animal Science Society, UK
  • Worlds Poultry Science Association (Belgium Branch)

Published Conference papers

57. Adewunmi, O.F., Ajadi, R.A., Bayode, D., Osinowo, O.A., Onagbesan, O.M. (2009). The effects of Archachatina maginata mucus on cutaneous wound healing in rabbits. Proceedings 34th Annual Confer. Nigerian Society of Animal Production, Uyo. Ed. Umoh et al. p202-205. (Oral presentation).

56. Adewunmi, O.F., Ajadi, R.A., Bayode, D., Osinowo, O.A., Onagbesan, O.M. (2009). Evaluation of the effects of trail mucus of Archachatina marginata on the haematological and organ morphology of Wistar rats. Proceedings 34th Annual Confer. Nigerian Society of Animal Production, Uyo. Ed. Umoh et al. p206-209. (Oral presentation).

55. Abiona, J.A., Akinduti, P.A., Oyekunle, M.O., Osinowo, O.A., Onagbesan, O.M. (2009). Preliminary investigation on the presence of agglutinins in the haemolymph of giant African land snail (Archachatina maginata). Proceedings 34th Annual Confer. Nigerian Society of Animal Production, Uyo. Ed. Umoh et al. p172-175. (Oral presentation).

54. Iyasere, O.S., Osinowo, O.A., Daramola, J.O., Onagbesan, O.M. (2009). Effects of stocking density and ventilation on the behaviour, welfare and performance of broiler chickens in South-Western Nigeria. Proceedings 34th Annual Confer. Nigerian Society of Animal Production, Uyo. Ed. Umoh et al. p435-437. (Oral presentation).

53. Tona, K., Bruggeman, V., Onagbesan, O., Gbeassor, M., Decuypere, E. (2008). Effects of incubation factors in combination with glucocorticoid administration on chicken embryo physiology. Proceedings 9th Intern. Symposium on Avian Endocrinol., Leuven, Belgium. 11-15th July 2008. (Poster presentation).

52. Bruggeman, V., Tona, K., Onagbesan, OM., Decuypere, E. (2007). Hatching egg and chick quality. Proceedings WPSA meeting on ‘Biology of breeding birds’, Edinburgh, Scotland. 23 – 25 July 2007, p 21. (Oral presentation).

51. Bruggeman, V., De Smit, L., Everaert, N., Witters, A., Debonne, M., Willemsen, H., Verhoelst, E., Tona, K., Onagbesan, O.M., De Baerdemaker, J., Arckens, L., Decuypere, E. The chicken embryo as a model for studying effects of differential CO2 concentrations during incubation. International Chick Meeting, Barcelona, 11-14th april, 2007. (Oral presentation).

50. Tona, K, Onagbesan, O., Bruggeman, V., Gbeassor, M., Decuypere, E. 2006. Effects de la non-ventilation pendant  l’incubation  et du dexamethasone sur les paramètres physiologiques et de production chez les poulets de chair. Les journées scientifiques internationales de Lomé, Togo. 23-27 October 2006.  (Communication orale).

49. Tona, K., Agbonon, A., Eklu-Gadegbeku, K., Tounouvi, K.M., Onagbesan, O., Koumaglo, K., Decuypere, E., Gbeassor, M. 2006. Elevage des Poules Pondeuses au Togo : Composantes des Rations Alimentaires et Comparaison entre les Performances de Production des Différentes Races de Poules Pondeuses. Les journées scientifiques internationales de Lomé, Togo. 23-27 October 2006.  (Communication orale).

48. E., Decuypere, O., Onagbesan, L., De Smit, K., Tona, N., Everaert, A., Witters, M., Debonne, E., Verhoelst, J., Buyse, M., Hassanzadeh, J., Debaerdemaeker, L., Arckens and V., Bruggeman (2006). Hypoxia and hypercapnia during incubation of chicken eggs on development and subsequent performance. XII European Poultry Conference, Verona, Italy 10 – 14 Sept 2006 (Invited presentation).

47. De Smit, L., Bruggeman, V., Debonne, M., Tona, K., Onagbesan, O, Kamers, B., Arckens, L., De Baerdemaker, J., Decuypere, E. (2005). The effects of a gradual increase of CO2 concentration during the first 10 days of incubation on embryonic growth and hatching. “2nd Combined Workshop of Fundamental Physiology of the European Working Group of Physiology and Perinatal Development in Poultry”. September 23 – 25, 2005, Berlin, Germany. (Oral presentation).

46. Decuypere, E., Onagbesan, O., Swennen, Q., Buyse, J., Bruggeman, V. (2005). The endocrine and metabolic interface of genotype-nutrition interaction in broilers and broiler breeders. European Symposium on Poultry Nutrition, Budapest. September, 2005. (Invited paper).

45. Veerle Bruggeman, Gert Van den Bergh, Stefan Clerens, Linn Dumez, Okanlawon Onagbesan, Lutgarde Arckens, Eddy Decuypere (2005). Analysis of differential protein patterns by fluorescent two-dimensional difference gel electrophoresis and mass spectrometry in liver and ovary of the one-day old chick induced by a single in ovo injection of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD). European Congress of Endocrinology, 3-7th September, Göteborg, Sweden. (Oral presentation).

44. Onagbesan OM, Bruggeman V, Tona K, Decuypere E. (2005). New perspectives for improving reproductive function in heavy broiler breeder females. 1st Nigerian International Poultry Summit (NIPS), 20-25 Feb 2005, Ota-Nigeria. (Oral presentation).

43. Onagbesan OM, Tona K, Decuypere E, Bruggeman V (2005). The effects of breeder age, chick quality and delayed feed access after hatch on broiler performance until 7 days of age. 1st Nigerian International Poultry Summit (NIPS), 20-25 Feb 2005, Ota-Nigeria. (Oral presentation).

42. Bruggeman V, Jego Y, Tona K, Onagbesan OM, Decuypere E (2004). Effects of broiler breeder genotypes on incubation parameters, chick quality and broiler performance. Proceedings of the XXII World Poultry Congress June 8-13, 2004, Istanbul. p 1016(Oral presentation).

41. Picard M, Bruggeman V, Jego Y, Onagbesan OM, Hocking P (2004). Growth and laying performances of two genotypes fed diluted diets ad libitum or restricted. Proceedings of the XXII World Poultry Congress June 8-13, 2004, Istanbul. p 1015. (Oral presentation).

40. Onagbesan OM, Bruggeman V, Van As P, Swennen Q, Decuypere E (2004). Implications of IGFs and BMPs on follicular development in broiler broiler breeder hens. Proceedings of the XXII World Poultry Congress June 8-13, 2004, Istanbul. p 1011. (Oral presentation).

39. Onagbesan OM, Bruggeman V, Duclos MJ, Decuypere E (2004). Systemic hormones variations in broiler breeder hens. Proceedings of the XXII World Poultry Congress June 8-13, 2004, Istanbul. p1008. (Oral presentation).

38. Onagbesan OM, Bruggeman V, Van As P, Swennen Q, Tona K, Decuypere E (2003). Effect of ad libitum or restricted feeding on the expression of bone morphogenetic proteins (BMP) and their receptors (BMPR) in the granulosa cells of chicken ovarian follicles and their role in cell differentiation and proliferation. Proceedings of the IX World Conference on Animal Production, Port Alegre, Brazil, 26-31 October 2003. Pp 214. (Oral presentation).

37. Tona K, Onagbesan OM, Bruggeman V, Decuypere E (2003). Effects of broiler breeder age and egg storage on egg quality, hatchability, chick quality and relative growth to slaughter weight at 42 days. SPSS/SCAD Concurrent meeting of International Poultry Scientific Forum, 20 – 22 Jan 2003, Atlanta – Georgia, USA. Proceedings Abstr 128, p 31 (Oral presentation).

36. Onagbesan OM, Van As P, Bruggeman V, Decuypere E (2003). Expression of mRNA encoding BMP-2, -4, -6, -7 and BMPR-IA, IB and -II in the ovarian follicles of the chicken. SPSS/SCAD Concurrent meeting of International Poultry Scientific Forum, 20 – 22 Jan 2003, Atlanta – Georgia, USA. Proceedings Abstr 50, p 13 (Oral presentation).
35. Van As P, Onagbesan OM, Bruggeman V, Jego Y, Williams J, Decuypere E (2002). Expression of BMPs and BMPRs in pre-hierarchical ovarian follicles of the domestic hen and probable involvement in follicle selection. Society for the Study of Fertility Joint European Conference on Reproduction, Tours, France 20-21 Dec 2002. Reproduction, Abstr Series No 29, Abstr 40, p 16-17 (Poster presentation).

34. Moraes VMB, Malheiros RD, Bruggeman V, Collin A, Tona K, Van As P, Onagbesan OM, Buyse J, Decuypere E, Macari M (2002). Physiological responses to heat stress during early development of broiler embryos. 11th European Poultry Conference, 6 – 10 September 2002, Bremen, Germany (Poster presentation).

33. Moraes VMB, Malheiros RD, Bruggeman V, Collin A, Tona K, Van As P, Onagbesan OM, Buyse J, Decuypere E, Macari M (2002). Effect of heat stress at pre-hatch stage on some physiological responses of broilers. 11th European Poultry Conference, 6 – 10 September 2002, Bremen, Germany (Oral presentation).

32. Tona K, Onagbesan OM,  et al (2002). Effects of broiler breeder age and egg storage time on hatching process. 11th European Poultry Conference, 6 – 10 September 2002, Bremen, Germany (Poster presentation).

31. Tona K, Bamelis F, Bruggeman V, Moraes VMB, Onagbesan O, Decuypere E ( 2002). Effect of egg storage time on spread of hatch, chick quality and chick juvenile growth. Incubation and Fertility Group Conference: 12th-13th Sept 2002: Oxford, UK (Oral presentation).

30. Tona K, Malheiros RD, Bruggeman V, De Ketelaere B, Moraes VMB, Onagbesan O, Decuypere E (2002). A model for predicting hatchability as a function of flock age, a reference hatchability, storage time and season. Incubation and Fertility Group Conference: 12th-13th Sept 2002: Oxford, UK (Poster presentation).

29. Hastie PM, Onagbesan OM, Haresign W (2002). Differential expression of mRNA encoding components of the insulin-like growth factor system in ovine corpora lutea at key stages of the oestrous cycle. 6th International Symposium on Reproduction in Domestic Ruminants: 14th -17th August 2002, Scotland, UK (Poster presentation).

28. Van As P, Onagbesan O, Bruggeman V, Decuypere E (2001). Quantification of pituitary-specific transcription factor-1 (pit-1) gene expression in chicken pituitary by quantitative competitive RT-PCR. Abstracts of the 5th European Congress of Endocrinology, Turin, Italy, 9-13 June 2001. (Oral presentation).

27. Van AS P, Beck V, Onagbesan O.M, Bruggeman V, Van der Geyten S, Darras V.M, Decuypere E (2001). Effect of refeeding on growth hormone extra- (GHRe) and intracellular domain (GHRi) gene expression in chicken liver. 4th International Conference of Farm Animal Endocrinology, Parma, Italy, October 2001. (Oral presentation).

26. Van As P, Janssens W, Onagbesan O, Bruggeman V, Decuypere E (2001). Quantification of GH extra- (GHRe) and intra-cellular domain (GHRi) gene expression in chicken liver by quantitative competitive RT-PCR. 5th European Congress of Endocrinology, Turin, 9-13 June, 2001. (Poster presentation)

25. Hastie PM, Hazlerigg DG, Onagbesan OM, Haresign W (2000). Expression of mRNA encoding insulin-like growth factor I (IGF-I), IGF-II, IGF-type I receptor, IGF-type II receptor and IGF binding proteins (IGFBP) in ovine ovarian follicles. Journal of Reproduction & Fertility, Abst Series 26, Abstract number 46, p19 (Poster presentation).

24. Dridi S, Williams J, Bruggeman V, Onagbesan M, Raver N, Decuypere E, Djian J, Gertler A, Taouis M (2000). Developpment du dosage radioimmunologique (RIA) specifique pour la leptine de poulet et des oiseaux. Biology of the Cell, 92, 7. (Oral presentation)

23. Williams J, Onagbesan OM, Dridi S, Durand M-T, Taouis M and Decuypere E (2000) Expression of IGF-I and IGF receptor mRNA in granulose and theca tissue in two strains of domestic hen. Journal of Reproduction & Fertility, Abst Series 25, Abstr number 148, p27; (Poster presentation).

22. Decuypere E, Bruggeman V, Onagbesan O, Safi M (1999). Endocrine physiology of reproduction in the female chicken:  old wine in new bottles. Proceedings of the International Conference on Avian Reproduction, INRA, Tours, France, 22-25 Sept 1999 (Invited paper: Oral presentation).

21. Van As P, Schaerlaekens T, Buys N, Onagbesan O.M, Decuypere E (1999). CDNA cloning of three Pit-1 transcription factors and expression of Pit-1 during embryogenesis in the chicken pituitary. Poultry Genetics Symposium, 6-8 October 1999, Mariensee, Germany. (Poster presentation).

20. Onagbesan OM, Safi M, Vleugels B, Decuypere E, Williams J (1999). Quantification of growth hormone receptor mRNA by competitive RT-PCR in granulosa and theca layer of the hen. Journal of Reproduction & Fertility, Abstr series 23, Abstr 13, pp 10: (Oral presentation).

19. Decuypere, Bruggeman V, Vermaut S, Safi M & Onagbesan OM. (1998). Growth factors in reproduction; the broiler breeder versus the laying hen or does obesitas impair reproduction ?  Proceedings of the avian Reproduction conference, 15-16 May, Sweden (invited paper: Oral presentation).

18. Safi M, Onagbesan OM, Vleugels, Buys N & Decuypere (1998). Regulation of inhibin (subunit mRNA levels in cultured chicken granulosa cells by IGF-I. Proceedings of the 3rd Intern Conference on Farm Animal Endocrinol, Brussels, 6-10 Dec 1998, Abstr rm1, 59 (Poster presentation).

17. Onagbesan OM, Vleugels B, Safi M & Decuypere E (1998). GH, LH, FSH and the IGFs interact to regulate the production of IGF-I and IGF-II by cultured granulosa cells.  Proceedings of  the 3rd Intern Conference on Farm Animal Endocrinol, Brussels, 6-10 Dec 1998 Abstr r4, 58, (Oral presentation)

16. Onagbesan O.M, Peddie M.J, Woolveridge I, Williams J & Duclos M  and IGF-I in granulosa cells during avian(1996). The role of TGF follicular maturation. Poultry & Avian Biology Reviews 6, (4), p292 (Oral presentation).

15. Onagbesan O.M. & Peddie M.J. (1995). Characterization of EGF receptors in cultured chicken granulosa cells: receptor expression and activation.  Journal of Endocrinology 145, Supplement, Abstr P75: 186th Meeting of the Soc for Endocrinology (Poster presentation).

14. Peddie M.J. & Onagbesan O.M. (1994). Alterations in calcium and adenylate cyclase activated steroidogenesis during follicular maturation in the chicken. Journal of Reproduction & Fertility Abstract series 13, Abstr 75: (Poster presentation).

13. Onagbesan O.M., Peddie M.J. & Woolveridge I. (1993). Demonstration  peptide in ovarian theca cells of the domestic hen. Journalof EGF/TGF of Endocrinology 137, Supplement, Abstr P175 (Poster presentation).

12. Onagbesan O.M., Peddie M.J. & Woolveridge I. (1993). Further evidence that theca cells of the avian ovary produce EGF-like peptides. Journal of Reproduction & Fertility Abstr series 11, Abstr 143: (Poster presentation).

11. Woolveridge I, Onagbesan O.M., &  binding to granulosaPeddie M.J. (1993) Alterations in the 125I-TGF and theca cells during follicular maturation in chickens. Journal of Reproduction & Fertility Abstr series 12, abstr No 58: (Poster presentation).

10. Peddie M.J., Onagbesan O.M. & Woolveridge I. (1992) Effects of IGF-1 on progesterone production by chicken granulosa cells.  Journal of Endocrinology 135 Suppl.  Abstr P3: (Poster presentation).

9.  Onagbesan O.M., Peddie M.J. (1992) Comparison of  and Theca conditioned medium on estrogenthe effects of EGF, TGF production by cultured avian theca cells.  Proceedings of the Vth Intern. Symposium on avian endocrinology, Edinburgh  13-17 Sept  1992 (Oral presentation).

8.  Onagbesan O.M,  Peddie M.J.,  Gullick W (1992)  Visualization of EGF-receptors, Progesterone receptors and dehydrogenase activity in the ovarian follicles of chickens. Proceedings of the Vth  Intern.  Symposium on avian endocrinology, Edinburgh  13-17 Sept  1992 (Poster presentation).

7. Woolveridge I.,  Onagbesan O.M.,  Peddie M.J. (1992)  Effect of cycloheximide on androstenedione secretion by the theca cells of chickens in vitro.  Journal of  Endocrinology. 132, Suppl. Abstr No 282: (Poster presentation).

6. Onagbesan O.M.,  Peddie M.J.,  Williams J.B.  on androstenedione production by the(1992)  Effect of EGF or TGF theca cells of chickens in vitro.   Journal of Endocrinology 132, Suppl. Abstr No. 283: (Poster presentation).

5. Peddie M.J.,  Onagbesan O.M.,  Williams J.B. (1991)  Effects of EGF and theca conditioned medium on progesterone production by avian granulosa cells in culture.  Journal of Reproduction & Fertility Abstr. Series No. 7, Abstr. No. 16: (Oral presentation).

4. Onagbesan O.M., Peddie M.J..,  Williams J.B. (1991)  Androstenedione secretion by avian theca cells cultured under defined conditions.  Journal of Rep roduction &  Fertility  Abstr.  Series No. 7,  Abstr. No. 17: (Oral presentation).

3. Onagbesan O.M., Peddie M.J.,  Williams J.B. (1991)  Effects of growth factors, serum, and gonadotrophins on cell morphology and oestrogen production by chicken theca cells cultured in defined medium.  Journal of Endocrinology 129, Suppl. (10th Joint Meeting BES, Brighton, U.K., April 1991) Abstr. No. 190: (Poster presentation).

2. Onagbesan O.M.,  Peddie M.J.,  Williams J.B. (1990)  Chicken theca cells cultured in defined media with or without growth factors.  Journal of Reproduction & Fertility  Abstr.  Series 6, Absrt  No. 17 (Oral presentation).

1. Onagbesan O.M.,  Peddie M.J.,  Williams J.B. (1990)  Progesterone secretion by cultured chicken granulosa cells in defined media: Responses to gonadotrophins and d.b. cyclic AMP.  Journal of Endocrinology 127,  Suppl.  Abstr.  103: (Poster presentation).

(a).   GeneBank publications (with EBML Ac. No.)

  1. Hastie P, Hazlerigg D, Onagbesan OM, Haresign W (2001). Complimentary DNA cloning of sheep IGF-type-II receptor mRNA. GeneBank; EMBL Ac. No. AF327649.
  2. Hastie P, Hazlerigg D, Onagbesan OM, Haresign W (2001). Complimentary DNA cloning of sheep IGFBP-6 mRNA. GeneBank; EMBL Ac. No. AF327653.
  3. Hastie P, Hazlerigg D, Onagbesan OM, Haresign W (2001). Complimentary DNA cloning of sheep IGFBP-5 mRNA. GeneBank; EMBL Ac. No. AF327652.
  4. Hastie P, Hazlerigg D, Onagbesan OM, Haresign W (2001). Complimentary DNA cloning of sheep IGFBP-3 mRNA. GeneBank; EMBL Ac. No. AF327651.
  5. Hastie P, Hazlerigg D, Onagbesan OM, Haresign W (2001). Complimentary DNA cloning of sheep IGFBP-1 mRNA. GeneBank; EMBL Ac. No. AF327650.
  6. Shi Z, Onagbesan OM, Williams J (2001). Complimentary DNA cloning of  chicken ovary leptin mRNA. GeneBank, EMBL Ac No AF432509
  7. Shi Z, Onagbesan OM, Williams J (2001). Complimentary DNA cloning of  chicken ovary leptin receptor mRNA. GeneBank, EMBL Ac No AF432510.
  8. Shi Z, Onagbesan OM, Williams J (2001). Complimentary DNA cloning of  chicken ovary Bcl-x mRNA. GeneBank, EMBL Ac No AF432511.
  9. Shi Z, Onagbesan OM, Williams J (2001). Complimentary DNA cloning of  chicken ovary Death receptor 6 mRNA. GeneBank, EMBL Ac No AF432512.
  10. Van AS P, Buys N, Onagbesan OM, Decuypere E (2000). Complimentary DNA cloning of Chicken pituitary specific transcription factor, Pit-1W* mRNA. GeneBank, EMBL Ac No AJ222692.
  11. Van AS P, Buys N, Onagbesan OM, Decuypere E (2000). Complimentary DNA cloning of Chicken pituitary specific transcription factor, Pit-1beta* mRNA. GeneBank, EMBL Ac No AJ236856.
  12. Van AS P, Buys N, Onagbesan OM, Decuypere E (2000). Complimentary DNA cloning of Chicken pituitary specific transcription factor mRNA. GeneBank, EMBL Ac No AJ236855.(b). Publications in peer-reviewed journals
  13. Abiona, J.A., Akinduti, I., Onagbesan, O.M. (2014). Comparative evaluation of haemagglutination potential of haemolymph from two species of giant African land snails (Archachatina marginata and Achatina achatina). Fish and Shellfish Immunology. 38, 96-100.
  14. Daramola, J.O., Sorongbe, T.A. Onagbesan, O.M., Jegede, A.V. Ladokun, A.O., Abiona, J.A., Abioja, M.O. and Ochefu, J. (2014).  Effect of fruit-juice on spermatozoa viability and lipid peroxidation of Red Sokoto buck during liquid storage.  Nigerian Journal of Animal Production, 41 (1): 16-27.
  15. Sorongbe, T.A. Daramola, J.O. Onagbesan, O.M., Jegede1, A.V., Ladokun, A.O., Abiona, J.A., Abioja, M.O., Ochefun, J., Sodipe, O.G. and Ajiboye, O.O. (2014). Protective effects of fruit on spermatozoa viability of West African Dwarf bucks during liquid storage. Journal of Applied Agricultural Research, 6 (1), 2014.
  16. Omoniyi, L., Jewell, K., Isah, O., Neumann, A., Onwuka, C., Onagbesan, O., Suen, G. (2013). An analysis of the ruminal bacterial microbiota in West African Dwarf sheep fed grass and browse tree-based diets. Journal of Applied Microbiology. 116, 1094-1105.
  17.  Oke, O.E., Obanla, L.O., Onagbesan, O.M., Daramola, J.O. (2013). Comparative developmental trajectory of four strains of chicken embryo during incubation and their post-hatch growth. Nigerian Journal of Animal Production, 40(2): 13-23.
  18.  Obanla, L.O., Oke, O.E., Onagbesan , O.M.  Williams, T. J.  Abioja, M. O.  Daramola, J. O., Abiona, J. A.  (2013). Nutrient utilization during incubation and post-hatch juvenile     growth of Nigerian indigenous chicken and two exotic strains of chicken under Nigerian     condition. Archivos de zootecnia, 62:6.
  19. Abiona, J.A., Akinwande, O.A., Olabode, B.T., Abioja , M.O., Ejilude, O., Ajayi, O. L., Daramola, J.O.,  Ladokun, A.O., Osinowo, O.A.,  Onagbesan, O.M. (2013). Effect of feed     type on growth, spermatozoa production and gonado-somatic index in Giant African land     snail (Archachatina marginata). Journal of Agriculture and Environment 13(1) (In press)
  20. Abiona, J.A., Akinduti, P.A., Oyekunle, M., Osinowo, O.A., Onagbesan, O.M. (2013). Comparative morphology of haemocytes from two species of giant african land snail’s (Archachatina marginata and Achatina achatina). Journal of Agriculture and Environment (In press).
  21.  Abiona, J.A., Akinduti, P.A., Osinowo, O.A., Onagbesan, O.M. ( 2013). Comaparative evaluation of Inhibitory Activity of Epiphgram from Albino and Normal Skinned Giant African land Snail (Archachatina marginata) Against Selected Bacteria Isolates. Ethiopian Journal of Environmental Studies and Management 6(2):117-181.
  22. Tona, K., Bahe, K., Kamers, B., Mertens, K., Kemps, B., Onagbesan, O.M., Decuypere, E., Gbeassor, M. (2013). Effects of egg storage conditions on eggshell resonant frequency and albumen characteristics. International Journal of Poultry Science 12, 130-134.
  23. Bemji, M.N., Ogundiyi, AI., Adebambo, OA., Dipeolu, MA., Onagbesan, OM., James, IJ., Osinowo, OA. (2012). Prevalence of coat colour phenotypes and its influence on mange infestation of West African Dwarf goat. Bulletin of Animal Health and Production in Africa 60, 431-441.
  24. Williams, T.J., Osinowo, O.A., Smith, O.F., James, I.J., Ikeobi, C.O.N., Onagbesan, O.M., Shittu, O.O., Solola, F.T. (2012). Effects of milking frequency on milk yield, dry matter intake and efficiency of feed utilization in WAD goats. Archivos de Zootecnia 61, 457-465.
  25. Iyasere, O.S., Daramola, J.O., Bemji, M.N., Adeleye O.O., Sobayo R.A., Iyasere E. Onagbesan, O.M. (2012).  Effects of stocking density and air velocity on behaviour and     performance of Anak broiler chickens in South-Western Nigeria.  International Journal of     Applied Animal Sciences, 1(2):52-56.
  26. Smith, O.F., Ogunsola, A.A., Ladokun, A.O., Ajadi, T.A., Onagbesan, O.M. (2012). Synergistic effects of insulin-like growth factor (IGF-II) and FSH on bovine granulose cells. Archivos de Zootecnia 61, 305 – 308.
  27. Ohwojakpor, O., Olowofeso, O., Adebambo, O.A., Onagbesan, O.M. (2012). Genetic diversity of chicken populations in South-South region of Nigeria using microsatellite markers. Egyptian Poultry Science 32, 263 – 271.
  28. Daniel, I.O., Adetumbi, J.A., Oyelakin, O.O., Olakojo, S.A., Ajala, M.O., Onagbesan, O., (2012). Application of SSR markers for genetic purity analysis of parental inbred lines and some commercial hybrid maize (Zea mays L.) American Journal of Experimental Agriculture 2, 597- 606.
  29. Ogundiyi, A., Bemji, MN., Adebambo, OA., Dipeolu, MA., Onagbesan, OM., James, IJ., Osinowo, OA. (2012). Prevalence of mange among West African Dwarf sheep and goats and associated haematological and biochemical parameters. Tropical Animal Health and Production in press.
  30. Akinduti, PA., Oluwadun, A., Iwalokun, BA., Oluwaseun, E., Onagbesan, O. (2011). Clonal dissemination of blaTEM beta-lactamase strain among enteric isolates in Abeokuta, Nigeria. Research Journal of Microbiology 6, 919-925.
  31. Abiona, JA., Osinowo, OA., Eruvbetine, D., Abioja, MO., Smith, OF., Daramola, JO., Ladokun, AO., James, IJ., Abe, OS., Onagbesan, OM. (2012). Accessory reproductive organs dimension of two species of Giant African Land snails Archachatina maginata and Achatina achatina at three liveweight ranges. Journal of Agricultural Science 4, 179-186.
  32. Atteh JO, Onagbesan OM, Tona K, Decuypere E, Buyse J, Geuns JMC. (2011). Nutritional profile of Stevia Rebaudiana (Bertoni) leaf and stem: potential use as supplement in animal feeds. Archivos de Zootecnia 60, (229), 133-136.
  33. Tona, K., Onagbesan, O., Bruggeman, V., Gbeassor, F.M., Decuypere, E. (2010). Relationship between hatching egg quality or incubation conditions and day-old chick quality. Nigerian Poultry Science Journal 7, 104-112.
  34. Nouboukpo, K.E., Tona, K., Kamers, B., Everaert, N., Willemsen, H., Onagbesan, O.M., Gbeassor, M., Decuypere, E. (2010). Effects of in ovo administration of L-carnitine on hatching events and juvenile performance of layer-type chick. International Journal of Poultry Science 9, 980-983.
  35. Tona, K., Onagbesan, O.M., Kamers, B., Everaert, N., Bruggeman, V., Decuypere, E. (2010). Comparison of Cobb and Ross strains of embryo physiology and chick juvenile growth. Poultry Science 89, 1677-1683.
  36. Stinchens, A., Mathur, P., Janssens, S., Bruggeman, V., Onagbesan, O.M., Schroyen, M., Spincemaille, G., Decuypere, E., Georges, M., Buys, N. (2010). Indirect effect of IGF2 intron3 g.3072G>A mutation on prolificacy in sows. Animal Genetics 41, 493-498.
  37. Onagbesan, O., Bruggeman, V., Decuypere, E. (2009). Intra-ovarian growth factors controlling ovarian function in avian ovary: a review. Animal Reproduction Science 111, 121-140.
  38. Kamers, B., Bruggeman, V., Everaert, N., Aerts, S., Onagbesan, O., Buyse, J., Alami, A., Decuypere, . (2008). CO2 culling with influenza containment system (I.C.S.); Physiological and ethical considerations. Nigerian Journal of Poultry Science 5, 138-144.
  39. Van Craeyveld, V., Swennen, K., Dornez, E., Van de Wiele, T., Marzorati, M., Verstraete,  M., Delaerdt, Y., Onagbesan, O., Decuypere, E., Buyse, J., De Ketelaere, B., Broekaert, W.F., Delcour, J.A., Courtin, C.M. (2008). Structurally different wheat-derived arabinoxylooligosaccharides have different prebiotic and fermentation properties. J. Nutrition 138, 2348-2355.
  40. Courtin, C.M., Broekaert, W.F., Swennen, K., Lescroart, O., Onagbesan, O., Buyse, J., Decuypere, E., Wan de Wiele, T., Verstraerte, W., Huyghebaert, G., Delcour, J.A. (2008). Dietary inclusion of wheat bran arabinoxylooligosaccharides has beneficial nutritional effects on chickens. Cereal Chemistry 85, 607-613.
  41. Willemson, H., Tona, K., Bruggeman, V., Onagbesan, O., Decuypere, E. (2008). Effects of high CO2 level during early incubation and late incubation in ovo dexamethasone injection on perinatal embryonic parameters and post hatch growth of broilers. British Poultry Science 49, 222-231.
  42. Tona K, Onagbesan O, Bruggeman V, Collin A, Berri C, Duclos MJ, Tesseraud S, Buyse J, Decuypere E, Yahav S (2008). Effects of heat conditioning at d 16 to 18 of incubation or during early broiler rearing on embryo physiology, post-hatch growth performance and heat tolerance. Archiv fur Geflugelkunde (European Poultry Science) 72, S. 75-83.
  43. De Smit, L., Bruggeman, V., Debonne, M., Tona, K., Onagbesan, O., Arckens, L., De Baerdemaeker, J. and Decuypere, E. (2008). The effects of non-ventillation during early incubation on the embryonic development of chicks of two commercial broiler strains differing in ascites susceptibility. Poultry Science 87, 551-560.
  44. Atteh JO, Onagbesan OM, Tona K, Decuypere E, Buyse J, Geuns JMC. (2008). Evaluation of supplementary stevia leaves (Stevia Rebaudiana, Bertoni) and stevioside in broiler diets: Effects on feed intake, nutrient metabolism, blood parameters, and growth performance. Journal of Animal Physiology and Animal Nutrition 92, 640-649.
  45. Onagbesan O, Bruggeman V, Tona K, Everaert N, De Smit L, Debonne M, Witters A, Decuypere E (2007). Role of gas exchange during storage and incubation of chicken hatching eggs: effects of hypoxia, hyperoxia and hypercapnia on embryogenesis and hatchability. World’s Poultry Science Journal 63, 557-573.
  46. Bruggeman V, Witters A, De Smit L, Debonne M, Everaert N, Kamers B, Onagbesan O, Degraeves P, Decuypere E. (2007). Changes in parameters related to acid-base balance in chicken embryos (Gallus domesticus) incubated under normal or high CO2 concentrations during the first ten days of incubation. Respiratory Physiology and Neurobiology 157, 147-154.
  47. Tona K, Onagbesan O, Bruggeman V, De Smit L, Figueiredo D, Decuypere E (2007). Non-ventilation during early incubation in combination with dexamethasone administration during late incubation: 1. Effects on physiological hormone levels, incubation duration and hatching events. Domestic Animal Endocrinology  33, 32-46.
  48. Bruggeman V, Van den Bergh G, Clerens S, Dumez L, Onagbesan O, Arkens L, Decuypere E. (2007) . Differential Protein Expression in Liver and Ovary of the One-Day-Old Chick as a Result of a Single in ovo Injection of 2,3,7,8-tetra-chlorodibenzo-p-dioxin . Feedinfo News Service Scientific Reviews. January 2007Decuypere, E., Onagbesan, O., Swennen, Q., Buyse, J., Bruggeman, V. (2007). The endocrine and metabolic interphase of genotype-nutrition interaction in broilers and broiler breeders. World’s Poultry Science Journal 63, 115-128.
  49. Tona, K., Onagbesan, O., De Ketelaere, B., Bruggeman, V., Decuypere, E. (2007). A model for predicting hatchability as a function of flock age, a reference hatchability, egg storage time and season. Archiv fur Geflugelkunde (European Poultry Science) 71 (1): 30 – 34.P.
  50. Van As, K. Janssens, K. Pals, B. De Groef, O. M. Onagbesan, V. Bruggeman, V. M. Darras, C. Denef and E. Decuypere (2006). The chicken pituitary-specific transcription factor Pit-1 is involved in the hypothalamic regulation of pituitary hormones. Acta Veterinaria Hungarica 54, 455-471.
  51. De Smit, L., Bruggeman, V., Tona, K., Debonne, M., Onagbesan, O., Arckens, L., De Baerdemaeker, J. and Decuypere, E (2006). Embryonic developmental plasticity: increased CO2 in the incubator during the early stages of incubation changes the developmental trajectories of the chick during prenatal and postnatal growth. Comparative Biochemistry and Physiology, Part A, 145; 166-175.
  52. Decuypere E. Hocking PM, Tona K, Onagbesan O, Bruggeman V, Jones EKM, Cassy S, Rideau N, Metayer S, Jego Y, Putterflam J, Tesseraud S, Collin A, Duclos M, Trevidy JJ, J Williams (2006). Broiler Breeder Paradox: a project report. World’s Poultry Science Journal 62, 443-453.
  53. Onagbesan, O.M., Metayer, S., Tona, K., Williams, J., Decuypere, E., Bruggeman, V. (2006). Effects of genotype and feed allowance on plasma LH, FSH, progesterone (P4), estradiol (E2) levels, in vitro granulosa cell P4 production and egg production rate of broiler breeder hens. Poultry Science 85, 1245-1258.
  54. Bruggeman V, Van den Bergh G, Clerens S, Dumez L, Onagbesan O, Arkens L, Decuypere E. (2006). Analysis of differential protein patterns by fluorescent two-dimensional difference gel electrophoresis and mass spectrometry in liver and ovary of the one-day old chick induced by a single in ovo injection of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD). Proteomics 6 (8), 2576-2585.
  55. De Smit L, Tona K, Bruggeman V, Onagbesan O, Hassanzadeh M, Arckens L, Decuypere E (2005). Comparison of three lines of broiler breeders differing in ascites susceptibility or growth rate: 2. Egg weight loss, gas pressures, embryonic heat production and physiological hormone levels. Poultry Science 84, 1446-1452.
  56. C. Careghi, K. Tona, O. Onagbesan, J. Buyse, E. Decuypere, V. Bruggeman (2005). The Effects of the Spread of Hatch and Interaction with Delayed Feed Access after Hatch on Broiler Performance until 7 Days of Age. Poultry Science 84, 1314-1320.
  57. Tona K, Kemps B, Bruggeman V, Bamelis F, De Smit L, Onagbesan O, De Baerdemacker J, Decuypere E (2005). Comparison of three lines of broiler breeders differing in ascites susceptibility or growth.1. Relationship between acoustic resonance data and embryonic or hatching parameters. Poultry Science 84, 1439-1445.
  58. Bruggeman V, Onagbesan OM, Dumez L, De Ketelaere B, Decuypere E (2005). Effects of early exposure to 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) on postnatal reproduction in the laying hen. Comparative Biochemistry and Physiology Part C: Toxicology and Pharmacolocgy 349-355.
  59. Tona K, Bruggeman V, Onagbesan OM, Mertens K, Gbeasor, Decuypere E (2005). Day-old Chick quality: Relationship to hatching egg quality, adequate incubation practice and prediction of broiler performance. Avian and Poultry Biology Reviews 16, (2) 109-119.
  60. Tona K, Onagbesan OM, Bruggeman V, Mertens K, Decuypere E (2005). Effects of Turning Duration During Incubation on Embryo Growth, Utilization of Albumen and Stress Regulation. Poultry Science 84, 315-320.
  61. Tona K, Onagbesan O, De Ketelaere B, Bruggeman V, Decuypere E (2005). Interrelationships between chick quality parameters and the effect of individual parameter on broiler relative growth to 7 days of age. Archiv fur Geflugelkunde (European Poultry Science) 69, S.67-72.
  62. Bruggeman V, Onagbesan, Ragot O, Cassy S, Favreau F, Jego Y, Trevidy J.J, Tona K,  Williams J, Decuypere E, Picard M (2005). Feed allowance – genotype interactions in broiler breeder hens. Poultry Science 84, 298-306.
  63. Dridi S, Onagbesan O, Swennen Q, Buyse J, Decuypere E, Taouis M. (2004). Gene expression, tissue distribution and potential physiological role of uncoupling protein in avian species. Comparative Biochemistry and Physiology, Part A 139, (3) 273-283.
  64. Heck A, Onagbesan O, Tona K, Metayer S, Puterflam J, Jego Y, Trevidy JJ, Decuypere E Williams J, Picard M, Bruggeman V (2004). Effects of ad libitum feeding on performance of different strains of broiler breeders. British Poultry Science 5, 695-703.
  65. Van As P, Careghi C, Bruggeman V, Onagbesan OM, Van der Geyten S,  Darras VM, Decuypere E (2004). Regulation of GH expression by TRH through the pituitary-specific transcription factor Pit-1 in chicken pituitary. Acta Veterinaria Hungarica 52, 389-402.
  66. Tona K, Onagbesan OM, Bruggeman V, Mertens K, Jego Y, Decuypere E (2004). Comparison of feed intake, blood metabolic parameters, body and organ weights of growing broilers originating from dwarf and standard broiler breeder lines. International Journal of Poultry Science 3, (6), 422-426.
  67. Hastie PM, Onagbesan OM, Haresign W (2004). Co-expression of messenger ribonucleic acids encoding IGF-I, IGF-II, type-I and type-II IGF-receptors and IGF-binding proteins (IGFBP-1 to -6) during follicular development in the ovary of seasonally anestrous ewes. Animal  Reproduction Science 84, 93-105.
  68. Onagbesan OM, Safi M, Decuypere E, Bruggeman V (2004) Developmental changes in inhibin α and inhibin/activin βA and βB mRNA levels in the gonads during post-hatch prepubertal development of male and female chickens. Molecular Reproduction and Development 68, 319-326.
  69. Moraes VMB, Malheiros RD, Bruggeman V, Collin A, Tona K, Van As P, Onagbesan OM, Buyse J, Decuypere E, Macari M (2004). The effect of timing of thermal conditioning during incubation on embryo physiological parameters and its relatioship to thermotolerance in adult broiler chickens. Journal of Thermal Biology 29, 55-61.
  70. Okagbare GO, Akpodiete OJ, Esiekpe O, Onagbesan OM (2004). Evaluation of Gmelina arborea leaves supplemented with grasses (Panicum maximum and Pennisetum purpureum) as feed for West African dwarf goats. Tropical Animal Health and Production 36, 593-598.
  71. Okagbare GO, Nwokoro SO, Onagbesan OM (2004). Protein and energy requirements of pre-weaned West African Dwarf goats fed soyabean diet as replacement for milk in a tropical environment. Tropical Animal Health and Production 36, 547-555.
  72. Tona K, Onagbesan OM, Jego Y, Kamers B, Decuypere E, Bruggeman V (2004). A comparison of embryo physiological parameters during incubation and production characteristics of broiler chicks from eggs o three lines of broiler breeders differing in genetic composition, growth rate and reproductive performance. Poultry Science 83, 507-513.
  73. Tona K, Onagbesan OM, Bruggeman V, De Ketelaere B and Decuypere E (2004). Effects of Age of Broiler Breeders and Egg Storage on Egg Quality, Hatchability, Chick Quality, Chick Weight and Chick Post-Hatch Growth. Journal of Applied Poultry Research 13, 10-18.
  74. Decuypere E, Onagbesan OM, Beerlandt G, Michels H, Peerters R, Bister JL, Paquay R (2004). Gene-specific pituitary gland responsiveness of ovariectomized FecB or FecC carrier and non-carrier ewe crosses with German Mutton Merino, Texel and Suffolk breeds to LHRH before and after oestradiol or progesterone treatments. Small Ruminant Research 51, 7-22.
  75. Tona K, Onagbesan OM, De Ketelaere B, Decuypere E, Bruggeman V (2003). Effects of turning duration during incubation on Corticosterone and Thyroid hormones levels, Gas Pressures in air cell, chick quality and juvenile growth. Poultry Science 82, 1974-1979.
  76. Bruggeman V, Swennen Q, De Katelaere B, Onagbesan O, Tona K, Decuypere E (2003). Effects of exposure to different doses of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) at three embryonic stages on hatchability and growth characteristics in broiler chickens (Gallus domesticus). Comparative Biochemistry and Physiology, part C: Toxicology and Pharmacolocgy 136, 17-28.
  77. Onagbesan OM, Bruggeman V, Van As P, Tona K, Williams J, Decuypere E (2003). BMPs and BMPRs in the chicken ovary and the effects of BMP-4 and –7 on granulosa cell proliferation and progesterone production in vitro. American Journal of  Physiology Endocrinology and Metabolism 285, E973-E983.
  78. Tona K, Malheiros RD, Bamelis F, Careghi C, Moraes VMB, Onagbesan OM. Decuypere E, Bruggeman V, (2003). Effects of storage time on incubating egg gas pressure, thyroid hormones and corticosterone levels in embryos, and their hatching parameters. Poultry Science 82: 840-845.
  79. Heck A, Metayer S, Onagbesan O.M., Williams J, Picard M (2003). Messenger RNA of components of the IGF System and GH and Insulin receptors in ovaries of broiler breeder hens fed ad libitum or restricted from 4 to 16 weeks of age. Domestic Animal Endocrinology 25, 287-294.
  80. Tona K, Bamelis F, De Ketelaere B, Bruggeman V, Moraes VMB, Buyse J, Onagbesan OM, Decuypere E (2003). Effects of egg storage time on spread of hatch, chick quality and chick juvenile growth. Poultry Science 82: 736-741.
  81. Moraes VMB, Malheiros RD, Bruggeman V, Collin A, Tona K, Van As P, Onagbesan OM, Buyse J, Decuypere E, Macari M (2003). Effect of thermal conditioning during embryonic development on aspects of physiological responses of broilers to heat stress.  Journal of Thermal Biology 28, 133 – 140.
  82. Safi M, Onagbesan OM, Bruggeman V, Vleugels B, Volckaert G, and Decuypere (2003). Regulation of inhibin subunit mRNA levels by gonadotrophins and IGF-I in cultured chicken granulosa cells. General & Comparative Endocrinology 131, 159-167.
  83. Decuypere E, Bruggeman V, Onagbesan O, Safi M (2002). Endocrine physiology of reproduction in the female chicken: old wine in new bottles. Avian and Poultry Biology Reviews 13, 145 – 153.
  84. Safi M, Onagbesan OM, Vanmontfort D, Bruggeman V, Decuypere E (2001). Developmental expression of activin/inhibin α and ßA subunit genes in the gonads of male and female chick embryos. General & Comparative Endocrinology 122 (3), 304-311.
  85. Van As P, Janssens W, Onagbesan OM, Bruggeman V, Buys N, Sanders J, Vandergeyten S, Darras VM, Decuypere E (2001). Quantification of growth hormone receptor extra- (GHRe) and intra-cellular domain (GHRi) gene expression in chicken liver by quantitative competitive RT-PCR. General & Comparative Endocrinology 122, 213-224.
  86. Vas As P, Buys N, Onagbesan OM, Decuypere E (2000). Complementary DNA cloning and ontogenic expression of Pituitary-specific transcription factor (Pit-1) of chickens (Gallus domesticus) from the pituitary gland. General & Comparative Endocrinology 120, 127-136.
  87. Onagbesan OM, Mast J, Godeerris B, Decuypere E (2000). Effects TNF on LH and IGF-I-modulated chicken granulosa cell proliferation and progesterone production during follicular development. Journal of Reproduction & Fertility  120, 433-442 .
  88. Dridi S, Williams J, Bruggeman V, Onagbesan M, Raver N, Decuypere E, Djiane J, Gertler A & Taouis M (2000). A chicken leptin specific radioimmunoassay. Domestic Animal Endocrinology 18, 325-335.
  89. Michels H, Decuypere E, Onagbesan O (2000). Litter size, ovulation rate and prenatal survival in relation to ewe body weight: genetics review. Small Ruminant Research 38, 199 – 209.
  90. Vanmontfort D, Onagbesan OM, Bruggeman V, Safi M, Williams J & Decuypere E (2000). Autocrini/paracrine effects of inhibin and activin in chicken ovary. British Poultry Science 41, (3) Supplement 1, 70-71.
  91. Safi M, Onagbesan OM, Vanmontfort D & Decuypere E (2000). Developmental expression of activin/inhibin subunits mRNA in the gonads of male and female chick embryos. British Poultry Science 41, (3) Supplement 1, 69-70.
  92. Bruggeman V, Onagbesan OM, Decuypere E (2000). Body weight, fat content, liver weight and plasma leptin levels in broiler breeder females reared under ad libitum feeding, restricted feeding or combinations of both until age of first egg. British Poultry Science 41, (3) Supplement 1, 57-59.
  93. Onagbesan OM, Vleugels B, Buys N, Bruggeman V, Safi M & Decuypere E (1999). Insulin-like growth factors in the regulation of avian ovarian functions. Domestic Animal Endocrinology  17, 299-313.
  94. Bruggeman V, Onagbesan OM, D’Hondt E, Buys N, Safi M, Vanmontfort D, Berghman L, Vandesande E & Decuypere E (1999). Effects of timing and duration of food restriction during rearing on reproductive characteristics in broiler breeder females. Poultry Science 78, 1424-1434.
  95. Onagbesan OM, Decuypere E, Leenstra F & Ehlhardt DA (1999). Differential effects of feeding level on cell proliferation and progesterone production in response to gonadotrophins and insulin-like growth factor-I by ovarian granulosa cells of broiler breeder chickens selected for fatness (GL) or leanness (FC). Journal of Reproduction & Fertility 116, 73-85.
  96. Decuypere E, Buys N & Onagbesan O (1998). A mechanistic approach for understanding nutritional and selection effects on reproductive functioning. In: Production Diseases in Farm Animals. Eds Th. Wensin. Wagennegen Press, Netherlands, p 173-182.
  97. Bruggeman V, D’Hondt E, Berghman L, Onagbesan O, Vanmontfort D, Vandesande F  and Decuypere E (1998). The Effect of food intake from 2 to 24 weeks of age on LHRH I content in the median eminence and gonadotrophin levels in pituitary and plasma in female broiler breeder chickens. General & Comparative Endocrinology 112, 200-209.
  98. Bruggeman V, Onagbesan OM, Vanmontfort D, Berghman L, Verhoven & Decuypere E (1998). The effect of long-term feed restriction on pituitary sensitivity to cLHRH-I in broiler breeder females. Journal of Reproduction & Fertility 114, 267-276.
  99. Vermaut S, De Coninck K, Bruggeman V, Onagbesan O, Flo G, Cokelaere M & Decuypere E (1998). Evaluation of jojoba meal as a potential supplement in the diet of broiler breeder females during laying. British Poultry Science 40, 284-291.
  100. Safi M, Buys N, Onagbesan OM, Vleugels B and Decuypere E (1998). Quantification of inhibin/activin subunits mRNA expression by competitive RT-PCR in chicken granulosa cells during follicular development. Biology of Reproduction 59, 1047-1054.
  101. Onagbesan O.M., Peddie M.J. (1998). The expression of TGF receptor protein and its activation in chicken ovarian granulosa cells of maturing follicles. The Histochemical Journal 30 (9), 647-656.
  102. Vermaut S, De Coninck K, Onagbesan M, Flo G, Cokelaere M and Decuypere E (1998). A jojoba-rich diet as a new forced molting method in poultry. Journal Applied Poultry Research 7, 239-246.
  103. Vermaut S, Onagbesan M, Bruggeman V, Berghman L, Flo G and Decuypere E (1998). Unidentified factors in jojoba meal prevent oviduct development in broiler breeder females. Journal of Agriculture & Food Chemistry 46, 194-201.
  104. Vermaut S, De Connick K, Flo G, Cokelaere M, Onagbesan M and Decuypere E (1997). The effect of deoiled Jojoba meal on feed intake in chicken; satiating or taste effect. Journal of Agriculture & Food Chemistry 45, 3158-3163.
  105. Onagbesan O.M, Woolveridge I. and Peddie M.J. (1996). Characterization of TGF receptors in avian ovary: alteration in ligand binding to cultured granulosa cells during maturation. Journal of Endocrinology 149, 171-179.
  106. Onagbesan O.M. and Peddie M.J. (1995). Effects of Insulin-like growth factor-1  and interactions with transforming growth factor-a and LH on chicken granulosa cell proliferation and progesterone production in culture. Journal of Reproduction & Fertility 104, 259-265.
  107. Williams J., Onagbesan M. & Peddie M. (1994). Actions des facteurs croissance sur l’ovaire de la poule domestique (Gallus domesticus). Contraception Fertility & Sexuality 22, (9), 577-586.
  108. Onagbesan O.M, Gullick W, Woolveridge I and Peddie M.J. (1994). Immunohistochemical localization of EGF receptors and EGF/TGFa-like peptides in chicken ovarian follicles. Journal of Reproduction & Fertility 102, 147-153.
  109. Onagbesan O.M.,  Peddie M.J.,  Williams J.B. (1994). Regulation of cell proliferation and estrogen synthesis by LH, IGF-I and EGF in the theca cells of the domestic hen cultured in defined media.  General & Comparative Endocrinology 94, 261-272.
  110. Peddie M.J.,  Onagbesan O.M.,  Williams J.B. (1994). Chicken granulosa cell proliferation and progesterone production in culture: effects of Epidermal growth factor and theca secretions. General & Comparative Endocrinology 94, 341-356.
  111. Peddie M.J., Onagbesan O.M. & Woolveridge I. (1993). The role of EGF and other factors in the paracrine and autocrine control of follicular development in the domestic hen.  In Avian Endocrinology, Ed. P.J. Sharp.  pp 321-330. Journal of Endocrinology Ltd., Bristol
  112. Onagbesan O.M. (1990). Lack of oxytocin effects on luteal functions in the guinea pig in vivo and in vitro.  Nigerain Journal of  Science  24,  43-49.
  113. Onagbesan O.M. (1989). Immunohistochemical localization of 3(- and 17(- hydroxy steroid  dehydrogenase enzymes in .the ovarian follicles of the Japanese quail  Nigerian Journal of  Science 23, 60-65.
  114. Onagbesan O.M., Peddie M.J. (1989). Calcium-dependent stimulation of oestrogen secretion by FSH from theca cells of the domestic hen.  General & Comparative  Endocrinology  75,  177-186.
  115. Onagbesan O.M.,  Peddie M.J. (1988). Steroid secretion by ovarian cells of Japanese quail.  General & Comparative  Endocrinology  72,  272-281.
  116. Onagbesan O.M.,  Peddie M.J. (1987). Induction of ovulation and oviposition in female quail with LH, LH-RH or Progesterone.  General & Comparative  Endocrinology  71,  124-131.
  117. Brain  P.C.,  Onagbesan O.M.,  Peddie M.J.,  Taylor T.G. (1986).  Changes in plasma concentrations of reproductive steroids in female Japanese quail raised on long or short photoperiods.  General &  Comparative  Endocrinology  69,  174-180.

    (c). Contribution in books

    1. Rurangwa, E., Akinwole, A.O., Abiona, B.G., Onagbesan, O.M. (2013). Urban and Peri-Urban aquaculture production systems in South Western Nigeria: Research and business opportunities. IMARES, University of Wageningen. Report No. C048/13, 64pp.
    2. Daramola, JO., Abioja, MO., Onagbesan, OM. (2012). Heat stress impact on livestock production. In; Environmental Stress and Amelioration in Livestock Production. Eds. V. Seijan et al. Springer-Verlag Berlin Heidelberg.4. Bruggeman V, Decuypere E & Onagbesan O (2004). Chickens: Broiler reproduction management. In: Encyclopedia of Animal Science. Eds WG Ponds and AW Bell, p 211-215. Marcel Dekker, Inc., NY.
    3. Decuypere E, Vanmontfort D, Safi M, Bruggeman V & Onagbesan M (2001). The inhibin family in the reproductive process of the hen. In: Avian Endocrinology. p 195-202. Eds A. Dawson and CM Chaturvedi. Narosa Publishers, India.
    4. Decuypere E, Buys N & Onagbesan O (1998). A mechanistic approach for understanding nutritional and selection effects on reproductive functioning. In: Production Diseases in Farm Animals. p 173-182. Eds Th. Wensin. Wagennegen Press, Netherlands.
    5. Peddie M.J., Onagbesan O.M. & Woolveridge I. (1993). The role of EGF and other factors in the paracrine and autocrine control of follicular development in the domestic hen.  In Avian Endocrinology, Ed. P.J. Sharp.  pp 321-330. Journal of Endocrinology Ltd., Bristol, UK.(d).  Published Conference papers
    6. Oke, O. E., Onagbesan, O. M., Ladokun, A. O., Adeyemi O. A. (2013). Effects of Deep   Litter System with or Without Access to Grasses or Legumes Pasture on Some Egg Quality Characteristics at Peak Production. Proceeding 38th Conference, Nigeria Society for Animal Production., Port Harcourt, Pp. 795-798.
    7. Oke, O.E., Onagbesan, O.M., Ladokun, A.O., Adeyemi, O.A., Abioja, M.O., Abiona, J.A. (2013). Effects of deep litter system with or without access to grasses or legume pastures on reproductive tract characteristics of layers. Proceedings 4th Nigeria International Poultry Summit, 17-21 February 2013, Federal University of Agriculture, Abeokuta, Nigeria. P91-98.
    8. Sodipe, O.G., Osinowo, O.A., Onagbesan, O.M., Bankole, O.M. (2013). Evaluation of Giant African land snails’s haemolymph (Archatina achatina and Archatina marginata) for cholesterol, glucose and trglyceride concentration. Proceedings of 2nd International Conference on Giant African land snail, 2-3 June 2013, Federal University of Agriculture, Abeokuta, Nigeria. Pp 40-45.
    9. Awosanya, A.A., Abiona, J.A., Osinowo, O.A., Ladokun, A.O., Abioja, M.O., Daramola, J.O., Onagbesan.O.M. (2013). Determination of estrogen receptor gene expression in the reproductive system of Archachatina marginata. Proceedings of 2nd International Conference on Giant African land snail, 2-3 June 2013, Federal University of Agriculture, Abeokuta, Nigeria. Pp 1-5.
    10. Abiona, J. A., Akinduti, P. A., Oyekunle, M., Osinowo, A. O., Onagbesan, O. M., (2012). Comparative evaluation of haemagglutination potential of haemolymph from two species of giant African land snails using erythrocytes from cattle, sheep, goat and chicken. Proceedings of the British Society of Animal Science and the Association of Veterinary Teaching and Research Work held in Nottingham UK, 24-25 April 2012. Barratt, D., Chaudhry, A.S., Cobb, M., Flockhart, J. French, A., Kenny, D. A., King, T., Mayes, R. W., Nash, D. M., Pollot,G., Richardson, R. I., Rooke, J. A., Rose, M., Rymer,C.,Sinclair, K., Steele, M. A., Wall, E., Wolf, B.T and Wylie, A. ( Eds) 3 (1): 107.
    11. Abiona, J.A., Oke, O.E., Akinduti, P.A.  Abioja, M.O., Onagbesan, O.M. (2012).
      Haemagglutination potential of layers raised on three rearing methods using natural agglutinins from giant African land snails (Archachatina marginata). ). Proceeding of the World Poultry Science Association, Lome, Togo. Pp 25-29.
    12. Oke, O.E., Onagbesan, O.M., Obanla, L.O., Iyasere, O.S. (2012). Comparative developmental trajectory of four strains of chicken embryo during incubation and their post-hatch growth. Proceeding of the World Poultry Science Association, Lome, Togo.  Pp 36-42.
    13. Oke, O. E., Obanla, L.O., Onagbesan, O.M., Solola, F.T., Iyasere, O.S. (2012). Evaluation of physiological parameters and growth performance among chicks from two exotic strains of layer chicken and Nigerian indigenous chicken. Proceeding of the World Poultry Science Association, Lome, Togo. Pp 43 -49.
    14. Solola, F.T, Obanla, L.O., Onagbesan, O.M. (2012).Comparative Embryonic Developmental Trajectory and Hatchability of Three Strains of Layer Chicken under a Nigerian Condition. Proceeding of the World Poultry Science Association, Lome, Togo.
    15. Iyasere, O. S., Daramola, J. O., Osinowo, J. O., Adio, B. R., Salami, M. I., Obanla, O., Ogunsola, O. A., Oke, O. E., Ochefu J. and Onagbesan, O. M. (2010). Grazing behavior of cow and ewes in sown pasture. Proceeding of the 35th Annual Conference of the Nigeria Society for Animal Production, Ibadan. Pp 622-624.
    16. Tona, K., Onagbesan, O.M., Kamer, B., Everaert, N., Bruggeman, V., Decuypere, E. (2009). Comparison of Cobb and Ross strains in embryo physiology and chick juvenile growth. Poultry Science Association, Annual Meeting, USA. (Oral Presentation).
    17. Tona, K., Bruggeman, V., Onagbesan, O.M., Gbeassor, M., Decuypere, E. (2008). Effets du sexe de lémbryon de poulet sur la duree díncubation et quelques parameters physiologiques et la croissance juvenile. X eme Journees Scientifiques Internationales de Lome. (oral presentation).
    18. Tona, K., Bruggeman, V., Onagbesan, O., Gbeassor, M., Decuypere, E. (2008). Effects of incubation factors in combination with glucocorticoid administration on chicken embryo physiology. Proceedings 9th Intern. Symposium on Avian Endocrinol., Leuven, Belgium. 11-15th July 2008. (Poster presentation). 
    19. Bruggeman, V., Tona, K., Onagbesan, OM., Decuypere, E. (2007). Hatching egg and chick quality. Proceedings WPSA meeting on ‘Biology of breeding birds’, Edinburgh, Scotland. 23 – 25 July 2007, p 21. (Oral presentation).
    20. Bruggeman, V., De Smit, L., Everaert, N., Witters, A., Debonne, M., Willemsen, H., Verhoelst, E., Tona, K., Onagbesan, O.M., De Baerdemaker, J., Arckens, L., Decuypere, E. (2007). The chicken embryo as a model for studying effects of differential CO2 concentrations during incubation. International Chick Meeting, Barcelona, 11-14th april, 2007. (Oral presentation). 
    21. Tona, K, Onagbesan, O., Bruggeman, V., Gbeassor, M., Decuypere, E. 2006. Effects de la non-ventilation pendant  l’incubation  et du dexamethasone sur les paramètres physiologiques et de production chez les poulets de chair. Les journées scientifiques internationales de Lomé, Togo. 23-27 October 2006.  (Communication orale).
    22. Tona, K., Agbonon, A., Eklu-Gadegbeku, K., Tounouvi, K.M., Onagbesan, O., Koumaglo, K., Decuypere, E., Gbeassor, M. 2006. Elevage des Poules Pondeuses au Togo : Composantes des Rations Alimentaires et Comparaison entre les Performances de Production des Différentes Races de Poules Pondeuses. Les journées scientifiques internationales de Lomé, Togo. 23-27 October 2006.  (Communication orale). 
    23. E., Decuypere, O., Onagbesan, L., De Smit, K., Tona, N., Everaert, A., Witters, M., Debonne, E., Verhoelst, J., Buyse, M., Hassanzadeh, J., Debaerdemaeker, L., Arckens and V., Bruggeman (2006). Hypoxia and hypercapnia during incubation of chicken eggs on development and subsequent performance. XII European Poultry Conference, Verona, Italy 10 – 14 Sept 2006 (Invited presentation). 
    24. De Smit, L., Bruggeman, V., Debonne, M., Tona, K., Onagbesan, O, Kamers, B., Arckens, L., De Baerdemaker, J., Decuypere, E. (2005). The effects of a gradual increase of CO2 concentration during the first 10 days of incubation on embryonic growth and hatching. “2nd Combined Workshop of Fundamental Physiology of the European Working Group of Physiology
      and Perinatal Development in Poultry”. September 23 – 25, 2005, Berlin, Germany. (Oral presentation). 
    25. Decuypere, E., Onagbesan, O., Swennen, Q., Buyse, J., Bruggeman, V. (2005). The endocrine and metabolic interface of genotype-nutrition interaction in broilers and broiler breeders. European Symposium on Poultry Nutrition, Budapest. September, 2005. (Invited paper). 
    26. Veerle Bruggeman, Gert Van den Bergh, Stefan Clerens, Linn Dumez, Okanlawon Onagbesan, Lutgarde Arckens, Eddy Decuypere (2005). Analysis of differential protein patterns by fluorescent two-dimensional difference gel electrophoresis and mass spectrometry in liver and ovary of the one-day old chick induced by a single in ovo injection of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD). European Congress of Endocrinology, 3-7th September, Göteborg, Sweden. (Oral presentation) 
    27. Onagbesan OM, Bruggeman V, Tona K, Decuypere E. (2005). New perspectives for improving reproductive function in heavy broiler breeder females. 1st Nigerian International Poultry Summit (NIPS), 20-25 Feb 2005, Ota-Nigeria. (Oral presentation). 
    28. Onagbesan OM, Tona K, Decuypere E, Bruggeman V (2005). The effects of breeder age, chick quality and delayed feed access after hatch on broiler performance until 7 days of age. 1st Nigerian International Poultry Summit (NIPS), 20-25 Feb 2005, Ota-Nigeria. (Oral presentation). 
    29. Bruggeman V, Jego Y, Tona K, Onagbesan OM, Decuypere E (2004). Effects of broiler breeder genotypes on incubation parameters, chick quality and broiler performance. Proceedings of the XXII World Poultry Congress June 8-13, 2004, Istanbul. p 1016(Oral presentation). 
    30. Picard M, Bruggeman V, Jego Y, Onagbesan OM, Hocking P (2004). Growth and laying performances of two genotypes fed diluted diets ad libitum or restricted. Proceedings of the XXII World Poultry Congress June 8-13, 2004, Istanbul. p 1015. (Oral presentation). 
    31. Onagbesan OM, Bruggeman V, Van As P, Swennen Q, Decuypere E (2004). Implications of IGFs and BMPs on follicular development in broiler broiler breeder hens. Proceedings of the XXII World Poultry Congress June 8-13, 2004, Istanbul. p 1011. (Oral presentation). 
    32. Onagbesan OM, Bruggeman V, Duclos MJ, Decuypere E (2004). Systemic hormones variations in broiler breeder hens. Proceedings of the XXII World Poultry Congress June 8-13, 2004, Istanbul. p1008. (Oral presentation). 
    33. Onagbesan OM, Bruggeman V, Van As P, Swennen Q, Tona K, Decuypere E (2003). Effect of ad libitum or restricted feeding on the expression of bone morphogenetic proteins (BMP) and their receptors (BMPR) in the granulosa cells of chicken ovarian follicles and their role in cell differentiation and proliferation. Proceedings of the IX World Conference on Animal Production, Port Alegre, Brazil, 26-31 October 2003. Pp 214. (Oral presentation). 
    34. Tona K, Onagbesan OM, Bruggeman V, Decuypere E (2003). Effects of broiler breeder age and egg storage on egg quality, hatchability, chick quality and relative growth to slaughter weight at 42 days. SPSS/SCAD Concurrent meeting of International Poultry Scientific Forum, 20 – 22 Jan 2003, Atlanta – Georgia, USA. Proceedings Abstr 128, p 31 (Oral presentation). 
    35. Onagbesan OM, Van As P, Bruggeman V, Decuypere E (2003). Expression of mRNA encoding BMP-2, -4, -6, -7 and BMPR-IA, IB and -II in the ovarian follicles of the chicken. SPSS/SCAD Concurrent meeting of International Poultry Scientific Forum, 20 – 22 Jan 2003, Atlanta – Georgia, USA. Proceedings Abstr 50, p 13 (Oral presentation). 
    36. Van As P, Onagbesan OM, Bruggeman V, Jego Y, Williams J, Decuypere E (2002). Expression of BMPs and BMPRs in pre-hierarchical ovarian follicles of the domestic hen and probable involvement in follicle selection. Society for the Study of Fertility Joint European Conference on Reproduction, Tours, France 20-21 Dec 2002. Reproduction, Abstr Series No 29, Abstr 40, p 16-17 (Poster presentation). 
    37. Moraes VMB, Malheiros RD, Bruggeman V, Collin A, Tona K, Van As P, Onagbesan OM, Buyse J, Decuypere E, Macari M (2002). Physiological responses to heat stress during early development of broiler embryos. 11th European Poultry Conference, 6 – 10 September 2002, Bremen, Germany (Poster presentation). 
    38. Moraes VMB, Malheiros RD, Bruggeman V, Collin A, Tona K, Van As P, Onagbesan OM, Buyse J, Decuypere E, Macari M (2002). Effect of heat stress at pre-hatch stage on some physiological responses of broilers. 11th European Poultry Conference, 6 – 10 September 2002, Bremen, Germany (Oral presentation). 
    39. Tona K, Onagbesan OM,  et al (2002). Effects of broiler breeder age and egg storage time on hatching process. 11th European Poultry Conference, 6 – 10 September 2002, Bremen, Germany (Poster presentation). 
    40. Tona K, Bamelis F, Bruggeman V, Moraes VMB, Onagbesan O, Decuypere E ( 2002). Effect of egg storage time on spread of hatch, chick quality and chick juvenile growth. Incubation and Fertility Group Conference: 12th-13th Sept 2002: Oxford, UK (Oral presentation). 
    41. Tona K, Malheiros RD, Bruggeman V, De Ketelaere B, Moraes VMB, Onagbesan O, Decuypere E (2002). A model for predicting hatchability as a function of flock age, a reference hatchability, storage time and season. Incubation and Fertility Group Conference: 12th-13th Sept 2002: Oxford, UK (Poster presentation). 
    42. Hastie PM, Onagbesan OM, Haresign W (2002). Differential expression of mRNA encoding components of the insulin-like growth factor system in ovine corpora lutea at key stages of the oestrous cycle. 6th International Symposium on Reproduction in Domestic Ruminants: 14th -17th August 2002, Scotland, UK (Poster presentation). 
    43. Van As P, Onagbesan O, Bruggeman V, Decuypere E (2001). Quantification of pituitary-specific transcription factor-1 (pit-1) gene expression in chicken pituitary by quantitative competitive RT-PCR. Abstracts of the 5th European Congress of Endocrinology, Turin, Italy, 9-13 June 2001. (Oral presentation). 
    44. Van AS P, Beck V, Onagbesan O.M, Bruggeman V, Van der Geyten S, Darras V.M, Decuypere E (2001). Effect of refeeding on growth hormone extra- (GHRe) and intracellular domain (GHRi) gene expression in chicken liver. 4th International Conference of Farm Animal Endocrinology, Parma, Italy, October 2001. (Oral presentation). 
    45. Van As P, Janssens W, Onagbesan O, Bruggeman V, Decuypere E (2001). Quantification of GH extra- (GHRe) and intra-cellular domain (GHRi) gene expression in chicken liver by quantitative competitive RT-PCR. 5th European Congress of Endocrinology, Turin, 9-13 June, 2001. (Poster presentation) 
    46. Hastie PM, Hazlerigg DG, Onagbesan OM, Haresign W (2000). Expression of mRNA encoding insulin-like growth factor I (IGF-I), IGF-II, IGF-type I receptor, IGF-type II receptor and IGF binding proteins (IGFBP) in ovine ovarian follicles. Journal of Reproduction & Fertility, Abst Series 26, Abstract number 46, p19 (Poster presentation). 
    47. Dridi S, Williams J, Bruggeman V, Onagbesan M, Raver N, Decuypere E, Djian J, Gertler A, Taouis M (2000). Developpment du dosage radioimmunologique (RIA) specifique pour la leptine de poulet et des oiseaux. Biology of the Cell, 92, 7. (Oral presentation) 
    48. Williams J, Onagbesan OM, Dridi S, Durand M-T, Taouis M and Decuypere E (2000) Expression of IGF-I and IGF receptor mRNA in granulose and theca tissue in two strains of domestic hen. Journal of Reproduction & Fertility, Abst Series 25, Abstr number 148, p27; (Poster presentation). 
    49. Decuypere E, Bruggeman V, Onagbesan O, Safi M (1999). Endocrine physiology of reproduction in the female chicken:  old wine in new bottles. Proceedings of the International Conference on Avian Reproduction, INRA, Tours, France, 22-25 Sept 1999 (Invited paper: Oral presentation). 
    50. Van As P, Schaerlaekens T, Buys N, Onagbesan O.M, Decuypere E (1999). CDNA cloning of three Pit-1 transcription factors and expression of Pit-1 during embryogenesis in the chicken pituitary. Poultry Genetics Symposium, 6-8 October 1999, Mariensee, Germany. (Poster presentation). 
    51. Onagbesan OM, Safi M, Vleugels B, Decuypere E, Williams J (1999). Quantification of growth hormone receptor mRNA by competitive RT-PCR in granulosa and theca layer of the hen. Journal of Reproduction & Fertility, Abstr series 23, Abstr 13, pp 10: (Oral presentation). 
    52. Decuypere, Bruggeman V, Vermaut S, Safi M & Onagbesan OM. (1998). Growth factors in reproduction; the broiler breeder versus the laying hen or does obesitas impair reproduction ?  Proceedings of the avian Reproduction conference, 15-16 May, Sweden (invited paper: Oral presentation). 
    53. Safi M, Onagbesan OM, Vleugels, Buys N & Decuypere (1998). Regulation of inhibin (subunit mRNA levels in cultured chicken granulosa cells by IGF-I. Proceedings of the 3rd Intern Conference on Farm Animal Endocrinol, Brussels, 6-10 Dec 1998, Abstr rm1, 59 (Poster presentation). 
    54. Onagbesan OM, Vleugels B, Safi M & Decuypere E (1998). GH, LH, FSH and the IGFs interact to regulate the production of IGF-I and IGF-II by cultured granulosa cells.  Proceedings of  the 3rd Intern Conference on Farm Animal Endocrinol, Brussels, 6-10 Dec 1998 Abstr r4, 58, (Oral presentation) 
    55. Onagbesan O.M, Peddie M.J, Woolveridge I, Williams J & Duclos M (1996). The role of TGFa and IGF-I in granulosa cells during avian follicular maturation. Poultry & Avian Biology Reviews 6, (4), p292 (Oral presentation). 
    56. Onagbesan O.M. & Peddie M.J. (1995). Characterization of EGF receptors in cultured chicken granulosa cells: receptor expression and activation.  Journal of Endocrinology 145, Supplement, Abstr P75: 186th Meeting of the Soc for Endocrinology (Poster presentation). 
    57. Peddie M.J. & Onagbesan O.M. (1994). Alterations in calcium and adenylate cyclase activated steroidogenesis during follicular maturation in the chicken. Journal of Reproduction & Fertility Abstract series 13, Abstr 75: (Poster presentation). 
    58. Onagbesan O.M., Peddie M.J. & Woolveridge I. (1993). Demonstration of EGF/TGFµ peptide in ovarian theca cells of the domestic hen. Journal of Endocrinology 137, Supplement, Abstr P175 (Poster presentation). 
    59. Onagbesan O.M., Peddie M.J. & Woolveridge I. (1993). Further evidence that theca cells of the avian ovary produce EGF-like peptides. Journal of Reproduction & Fertility Abstr series 11, Abstr 143: (Poster presentation). 
    60. Woolveridge I, Onagbesan O.M., & Peddie M.J. (1993) Alterations in the 125I-TGFµ binding to granulosa and theca cells during follicular maturation in chickens. Journal of Reproduction & Fertility Abstr series 12, abstr No 58: (Poster presentation). 
    61. Peddie M.J., Onagbesan O.M. & Woolveridge I. (1992) Effects of IGF-1 on progesterone production by chicken granulosa cells.  Journal of Endocrinology 135 Suppl.  Abstr P3: (Poster presentation). 
    62. Onagbesan O.M., Peddie M.J. (1992) Comparison of the effects of EGF, TGFa and Theca conditioned medium on estrogen production by cultured avian theca cells.  Proceedings of the Vth Intern. Symposium on avian endocrinology, Edinburgh  13-17 Sept  1992 (Oral presentation). 
    63. Onagbesan O.M,  Peddie M.J.,  Gullick W (1992)  Visualization of EGF-receptors, Progesterone receptors and dehydrogenase activity in the ovarian follicles of chickens. Proceedings of the Vth  Intern.  Symposium on avian endocrinology, Edinburgh  13-17 Sept  1992 (Poster presentation). 
    64. Woolveridge I.,  Onagbesan O.M.,  Peddie M.J. (1992)  Effect of cycloheximide on androstenedione secretion by the theca cells of chickens in vitro.  Journal of  Endocrinology. 132, Suppl. Abstr No 282: (Poster presentation). 
    65. Onagbesan O.M.,  Peddie M.J.,  Williams J.B. (1992)  Effect of EGF or TGFµ on androstenedione production by the theca cells of chickens in vitro.   Journal of Endocrinology 132, Suppl. Abstr No. 283: (Poster presentation). 
    66. Peddie M.J.,  Onagbesan O.M.,  Williams J.B. (1991)  Effects of EGF and theca conditioned medium on progesterone production by avian granulosa cells in culture.  Journal of Reproduction & Fertility Abstr. Series No. 7, Abstr. No. 16: (Oral presentation). 
    67. Onagbesan O.M., Peddie M.J..,  Williams J.B. (1991)  Androstenedione secretion by avian theca cells cultured under defined conditions.  Journal of Reproduction &  Fertility  Abstr.  Series No. 7,  Abstr. No. 17: (Oral presentation). 
    68. Onagbesan O.M., Peddie M.J.,  Williams J.B. (1991)  Effects of growth factors, serum, and gonadotrophins on cell morphology and oestrogen production by chicken theca cells cultured in defined medium.  Journal of Endocrinology 129, Suppl. (10th Joint Meeting BES, Brighton, U.K., April 1991) Abstr. No. 190: (Poster presentation). 
    69. Onagbesan O.M.,  Peddie M.J.,  Williams J.B. (1990)  Chicken theca cells cultured in defined media with or without growth factors.  Journal of Reproduction & Fertility  Abstr.  Series 6, Absrt  No. 17 (Oral presentation). 
    70. Onagbesan O.M.,  Peddie M.J.,  Williams J.B. (1990)  Progesterone secretion by cultured chicken granulosa cells in defined media: Responses to gonadotrophins and d.b. cyclic AMP.  Journal of Endocrinology 127,  Suppl.  Abstr.  103: (Poster presentation).(e). Technical Reports

       

    71. Project reports of granted research: yearly and final reports of research conducted with grants.
    72. Technical reports for commissioned consultancies.

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