Supplementing the Beltsville Extender With Mitoquinol Improves the Quality and Fertility Potential of the Rooster's Cooled Sperm.

Supplementing freeze diluents with certain antioxidants can maintain the quality of chilled sperm. The present study was an attempt to investigate the effect of Beltsville extender supplementation with the mitochondrial-targeted antioxidant 'Mitoquinol' on the quality parameters and fertility potential of rooster sperm during the cooling process. Semen samples were diluted in Beltsville extender, divided into five groups, and supplemented with 0, 1, 10, 100 and 1000 nM Mitoquinol. Samples were stored at 5°C for up to 50 h and then assayed for sperm motility, viability, mitochondrial function, membrane integrity and malondialdehyde concentration after 0, 25 and 50 h of cooling. To assess reproductive performance, artificial insemination was performed using sperm cooled for 25 h. The results showed no differences between groups at the beginning time. Extender supplementation with 10 and 100 nM Mitoquinol resulted in an improvement in total motility, progressive motility, membrane integrity, mitochondrial function and viability (p ≤ 0.05), as well as a lower malondialdehyde concentration (p ≤ 0.05) in comparison to the other groups during 25 and 50 h storage. Fertility rates were higher when roosters were inseminated with semen samples supplemented with 10 and 100 nM Mitoquinol, compared to the control group. Therefore, supplementing Beltsville extender with Mitoquinol (10 and 100 nM) effective in improving the quality and fertility potential of cooled rooster sperm.