The effect of coenzyme Q10 on rooster semen preservation in cooling condition.

Oxidative stress has been known as a significant cause of the lower fertility rates correlated with liquid stored rooster semen. The effect of coenzyme Q10 (CoQ10), as a powerful antioxidant, seems be beneficial on semen storage of broiler breeder roosters at the cooled condition. Therefore, two experiments were performed to assess the effect of CoQ10 supplemented semen extender on sperm quality parameters, fertility, hatchability and sperm penetration (SP) rates of rooster semen stored at 5 °C. In the first experiment, semen samples of 12 roosters were weekly pooled for four weeks (47-50 weeks of age). The pooled semen was diluted by modified Beltsville poultry semen extender and divided into three equivalent parts containing different levels of CoQ10 [0 (Q-0), 100 (Q-100) and 200 (Q-200) μM/mL) and then stored for 24 h at 5 °C. Sperm quality including progressive motility, plasma membrane integrity and functionality were evaluated after 0 and 24 h storage. The results showed that progressive motility, plasma membrane integrity and functionality were improved in Q-200 compared to Q-0 after 24 h storage at 5 °C (P < 0.01, P < 0.05 and P < 0.01, respectively). According to the results of the first experiment, Q-200 group was selected to be used to evaluate the fertility, hatchability and SP rate in the second experiment during next four weeks (51-54 weeks of age). The results of the second experiment showed that fertility rate was significantly increased in Q-200 compared to control group by approximately 10%, although no significant difference was observed in hatchability and SP rates between Q-200 and control groups. In conclusion, the results of the present research confirm that supplementation of rooster semen extender with CoQ10 might be potentially used to improve semen quality and fertility rates.