The effect of some environmental and disease factors on testicular and epididymal functions of zebu bulls and their friesian crosses. The influence of season on ejaculate characteristic on A.I. bulls

The study was conducted to determine the influence of season on ejaculate characteristics and semen quality of artificial insemination bulls at NAPRI i.e bulls made up of charolis, Bunaji, Sokoto Gudali, Friesian and FRx Bunaji bulls, over a 2 year period. Semen was collected twice weekly and evaluated for volume, colour, PH concentration, motility, presence or absence of foreign materials, live-dead counts and sperm abnormalities. While there were no significant seasonal differences in percentage sperm motility (P>0.05), semen volume, sperm concentrations, morphological sperm defects and sperm live-dead counts were significantly influenced by season (