Effect of Mare Colostrum in Extenders for Freezing Stallion Semen.

The research article is about a study exploring the efficacy of using mare colostrum in freezing extenders to enhance the quality of stallion sperm.

Objective

This research was aimed at assessing the impact of mare colostrum, a type of milk produced by mares after giving birth, on the quality of stallion sperm when added to freezing extenders. The primary goal was to enhance sperm quality through cryopreservation, a process that involves freezing and storing samples.

Methodology

• Colostrum samples were collected from four mares after they had given birth. The composition of these samples was then determined.
• Ejaculates were collected from nine fertile stallions. These samples were pooled, diluted, and cryopreserved.
• Three experimental extender groups were created for the study. The first group used a lactose-based extender supplemented with 20% mare colostrum, the second used a lactose-based extender supplemented with 20% egg yolk, and the third used BotuCrio, a commercial freezing extender.
• The post-thaw quality of the semen samples was evaluated based on various parameters, including viability, motility, acrosome integrity, plasma membrane functionality, and DNA denaturation.

Results

• The analysis found no significant differences in total motility, acrosome integrity, and DNA fragmentation across the three extender samples after thawing.
• Significantly higher values for certain parameters were noted in the BotuCrio extender when compared to the lactose extenders.
• The extenders with BotuCrio and lactose colostrum performed significantly better in the hypo-osmotic swelling (HOS) test, linearity, straightness, and wobble than the egg yolk extender.
• However, in terms of sperm viability, the lactose egg yolk extender showed significantly better results than the other seminal experimental media.

Conclusion

The study concluded that the inclusion of mare colostrum in cryopreservation media protected the sperm against cold-shock. This makes it a viable alternative cryoprotectant agent in extenders for freezing stallion semen. But more research would be needed to determine the ideal concentration and to understand the exact mechanism of how mare colostrum works as a cryoprotecting agent.