Effect of addition of buserelin acetate to the extender on motility and viability of bovine spermatozoa.

The present study was aimed to determine the effect of GnRH analog (buserelin acetate) on the quality of bovine spermatozoa stored at 16° C for 24 h. Semen collected in the summer season from June to September from healthy Polish Holstein-Friesian bulls. Ejaculates were centrifuged, divided and diluted to the final concentration of 240 × 10 spermatozoa/mL using animal protein-free commercial BIOXcell extender (IMV Technologies, L'aigle, France) (Control) or with BIOXcell extender supplemented with buserelin acetate and stored 0, 8 and 24 h. Sperm motility parameters analysis was performed using a computer-assisted sperm analysis (CASA) system. The viability of spermatozoa was performed using flow cytometer. The addition of buserelin acetate to BIOXcell extender did positively affect the total motility (was higher in the observed samples with the addition of 2 µg/mL and 4 µg/mL than in the control group), progressive motile (forward progressing sperm was significantly increased (p < 0.05) over the control group at the 0 h and 8 h of incubation following the supplementation of 2, 4 and 8 μg/mL buserelin acetate) and viability of spermatozoa (the number of live spermatozoa was significantly higher (p < 0.05) in 2 µg/mL and 4 µg/mL samples with buserelin acetate at 8th hour of incubation and in sample with 4 µg/mL at 24th hour of incubation compared to the control group). We recommend adding 4 µg/mL to the extender to improve the quality of bovine semen.