Authors:V.O. Sekoni , D.I. Saror , C.O. Njoku , J. Kumi-Diaka
Int. Volume 33, Issue 4, April 1990, Pages 925–936
Abstract
Twenty-four Zebu bulls were used in a 12-wk long study. Eight bulls were infected with , eight others with and eight bulls served as controls. All the infected bulls developed chronic trypanosomiasis.
Mean percentage base-line values prior to infection for acrosomal, sperm-head, detached heads, proximal cytoplasmic droplets, distal cytoplasmic droplets, sperm-tail, midpiece and total sperm morphological abnormalities ranged between 0.1±0.1 for acrosomal and 8.7±3.4 for total morphological abnormalities in the semen of the bulls. These values were very low and within the range of those for fertile bulls. Following infection, there was a progressive increase in the mean values of all the abnormalities. Peak percentage mean values recorded for total sperm morphological abnormalities in the course of the investigation in the bulls infected with and and in the controls were 95±7.2, 100±0 and 7.9±5.0, respectively. Mean percentage values throughout the duration of the investigation for control bulls were low and within the normal range for fertile bulls. These values differed (P<0.001) from the elevated values of the infected bulls.
The results indicate that trypanosomiasis due to either or infections can cause a marked increase in morphological abnormalities of spermatozoa which can, in turn reduce the fertility of breeding bulls.