Effect of Supplementation of Polyvinylpyrrolidone in Extender on Buffalo Semen Parameters

The current study was planned to evaluate the supplementation of Polyvinylpyrrolidone in extender on cryopreservation of Nili-Ravi buffalo bull semen. The semen samples were collected from Nili-Ravi buffalo (Bubalus bubalis) bull kept at SPU Qadirabad, District Sahiwal, Pakistan. Qualifying semen ejaculates having motility >60%, volume >5-6ml and concentration >0.5 billion/ ml were diluted 50 x 10(6) motile sperm ml approximately at 37 degrees C in Tris-citric acid extender supplemented with different concentrations of PVP (0.01, 0.05, 0.1mM). The extender without PVP was kept as control. Semen was stored at 4 degrees C for a period of 2 h and kept at 4 degrees C for 4h. Semen was filled in 0.5 ml French straws using suction pump at 4 degrees C, plunged and stored in liquid nitrogen (-196 degrees C). Semen straws were rewarmed at 37 degrees C for 30 seconds and assessed for sperm motility, plasma membrane integrity (PMI), dead sperm percentage and the live sperm percentage. The data on the role of PVP on different parameters of semen quality were analyzed by using ANOVA and RCBD. Higher percentage (P< 0.05) of sperm motility (66.1 +/- 7.51 and 59.4 +/- 10.72) and PMI (72.9 +/- 5.39 and 75.7 +/- 6.5) was observed in extenders having 0.05 mM and 0.1mM PVP compared to extenders having 1.5mM PVP and control. The percentage acrosomal integrity was observed greater (P< 0.05) in extended semen containing 0.1mM (68.2 +/- 0.50) PVP compared to extenders having 0.01 and control.