[Preservation capability of horse semen by the use of two diluents and preservation temperatures].

This article investigates the preservation of horse semen using two different diluents and preservation temperatures, and finds that a glycine-containing extender maintained sperm viability better than a skim milk extender for storage beyond 24 hours.

Types of Diluents Used

• Skim milk extender: This is one of the commonly used diluents in semen preservation. It is generally used when the semen is to be used on the day of its collection.
• Glycine-containing extender: The researchers employed this extender to investigate its effectiveness in preserving semen for over 24 hours. Glycine is a naturally occurring amino acid which has been observed to increase the survivability of sperm cells in preliminary studies.

Study Design and Methods

• The researchers collected samples of stallion semen and then extended and preserved them using the two different diluents: the skim milk extender and the glycine-containing extender.
• The preserved semen was then stored at two different temperatures: 5 degrees Celsius and room temperature.
• The researchers examined the motility (movement) and acrosome morphology (shape and structure of the acrosome, a component of the sperm cell vital for fertilizing the egg) of the extended sperm cells both at the start of preservation and after 24 hours.

Findings

• There was no notable difference between the two extenders when it came to preserving the morphology of the acrosome component of the sperm cells.
• After 24 hours of preservation, the motility of the sperm cells preserved with the glycine-containing extender was significantly better than those preserved with the skim milk extender.
• The researchers found that storing the preserved semen at 5 degrees Celsius resulted in better outcomes than storing it at room temperature, irrespective of the type of extender used.

Conclusion

• The findings indicate that while the skim milk extender is suitable for preserving semen intended for use within the same day of its collection, the glycine-containing extender can maintain sperm viability for up to 72 hours.
• Further, the study suggests that a cooler storage temperature (5°C) enhances the preservation capability of semen regardless of the type of diluent used, making it a preferable storage condition.