Effect of age and breeding season on the freezability of buffalo bull semen
1998
Younis, M. | Samad, H.A. | Ahmad, N. | Ali, C.S. (University of Agriculture, Faisalabad (Pakistan). Dept. of Veterinary Science)
The freezability of semen collected during the low (May-July) and the peak (September-November) breeding seasons from 18 Nili-Ravi buffalo bulls of young (3-4 years), adult (6-8 years) and old (12-15 years) age groups was studied. After extension in lactose-fructose-egg- yolk-glycerol extender, semen samples cozen and stored in liquid nitrogen. Post-thaw motility and liveability of spermatozoa were higher (p0.05) in adult than in young and old bulls and during the peak than the low breeding season. Sperm abnormalities in frozen-thawed semen from bulls of young, adult and old groups differed significantly (p0.05), and were higher (p0.05) during the low than the peak breeding season. GOT arid GPT activities in fresh, diluted and frozen-thawed seminal plasma from young and old bulls were higher (P0.05) than that of adults. GOT and GPT activities in seminal plasma of fresh, diluted and frozen-thawed semen were higher (p0.05) in the low than the peak breeding season. Due to freezing, GOT activity in seminal plasma of young, adult and old bulls increased by 29.80, 21.12 and 38.15% , respectively. The corresponding values for GPT activity were 16.22, 16.33 and 40.74%. It was concluded that the semen freezability was better in adult buffalo bulls than young or old bulls, and during the peak than the low breeding season.
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