Coenzyme Q10 and melatonin protect cryopreserved equine sperm against lipoperoxidation.

The study, based on 20 ejaculations from five stallions, explored the effectiveness of antioxidants Coenzyme Q10 (CoQ10) and melatonin in equine semen cryopreservation, ultimately finding that these antioxidants significantly reduced lipoperoxidation, thus enhancing the quality of sperm and their preservation.

Understanding the Research

• The research aimed to investigate the impact of adding varying concentrations of the antioxidants Coenzyme Q10 (CoQ10) and melatonin to the freezing diluent used for equine sperm during the cryopreservation process. The main focus was on the process of lipoperoxidation, an oxidation process that can negatively affect the integrity of sperm.
• The antioxidants were added alone and in combination, forming part of different groups: Control (C – no antioxidants), MEL1 and MEL2 (varying quantities of melatonin), Q1 and Q2 (varying quantities of CoQ10) and Q1+MEL1 (CoQ10 plus melatonin).
• The experiment was conducted with 20 ejaculates gathered from five different stallions to ensure a diverse set of samples.

Key Findings

• The Q1 and Q2 groups, which contained CoQ10, exhibited intact plasma membranes and a high level of mitochondrial membrane potential after 30 and 60 minutes of incubation compared to the control group. This suggests that CoQ10 may help in maintaining the integrity and function of spermatozoa during the freezing process.
• Groups supplemented with melatonin (MEL1 and MEL2) demonstrated enhanced resistance against damaging oxidative stress, displaying higher membrane stability over the observation period compared to the control group.
• Notably, when antioxidants were used alone or together, there were lower levels of lipoperoxidation compared to the control group. This suggests that both CoQ10 and melatonin have a significant antioxidative effect, increasing the preservation quality of sperm.

Conclusion

• The research concluded that CoQ10 and melatonin are effective antioxidants in the cryopreservation of equine semen, decreasing lipoperoxidation levels and hence promoting a higher percentage of spermatozoa with high mitochondrial potential, total and progressive motility, and prevention of membrane lipid disorder.
• This study may have significant implications for the equine breeding industry, as it indicates that the use of these antioxidants could potentially improve the success rate of artificial insemination procedures by enhancing the quality and resilience of frozen sperm.