Efficiency of short-term storage of equine semen in a simple-design cooling system.

The research paper discusses the efficiency of a low-cost cooling system for storing equine semen for up to 48 hours. The primary variables measured were progressive motility, plasma membrane integrity, and pregnancy rates, which were then compared with a control system.

Introduction and Methodology

• The research carried out five experiments to examine the effectiveness of a low-cost, simple cooling system (known as CP) for cooling and keeping equine semen at 2.0 degrees Celsius for 24 and 48 hours.
• The semen used for these experiments came from Pantaneiro stallions of confirmed fertility.
• Researchers assessed the quality of the semen through several parameters including progressive motility (PM), plasma membrane integrity (PMI), and the subsequent pregnancy rate.

Comparisons and Evaluation

• In the first experiment, the researchers demonstrated that the progressive motility (PM) and plasma membrane integrity (PMI) of sperm stored in the CP initiative compared favorably to those kept in the control system (called Equitainer).
• The second experiment evaluated how different combinations of sperm volumes (50/100 ml) and sperm concentrations (500/750 x10^6) affected the sperm quality when cooled and stored using the CP system.
• It was observed that while PM fell progressively from the pre-cooling stage to 24 hours and then to 48 hours, PMI only decreased at the lowest and highest sperm volume and concentrations. The length of storage did not impact PMI.

Results and Conclusions

• The results from the third experiment showed that the CP system could maintain a semen PM of over or equal to 30% in all samples, 24 hours after cooling. The PM rate decreased to around 70% about 42 hours after cooling.
• The fourth and fifth experiments confirmed that there was good semen quality after cooling and storage for 24 hours and 48 hours respectively.
• A notable success rate of 69% was achieved in the first estrous cycle in which insemination took place.
• As a result of these tests, the researchers concluded that the CP system is a satisfactory method for cooling and preserving equine semen for up to 48 hours.