Cryopreservation of Peruvian Paso horse spermatozoa: dimethylacetamide preserved an optimal sperm function compared to dimethyl sulfoxide, ethylene glycol and glycerol.

This research evaluates the effect of multiple cryoprotectors on the preservation of Peruvian Paso horse semen. The study finds that the use of dimethylacetamide (DMA) outperforms other agents in preserving sperm motility and viability.

Overview of the Study

• This study’s goal was to analyze the impacts of various cryoprotectors on the cryopreservation process (preserving cells or tissues by cooling them to sub-zero temperatures) of Peruvian Paso horse semen.
• The researchers looked at the effects of four different cryoprotectant agents – dimethylacetamide (DMA), dimethyl sulfoxide (DMSO), ethylene glycol (EG), and glycerol (GLY) – using three different concentrations for each agent (3%, 4% and 5%).
• Throughout the study, 20 semen samples were gathered from five different Peruvian Paso horse stallions. Each sample was then divided into 12 parts, each part assigned to each grouping based on the cryoprotectant agent and concentration.

Method and Findings

• The semen samples were frozen with the help of a rate-controlled freezer. Once the samples were thawed, two key sperm parameters were evaluated – motility (the ability of the sperm to move properly) and viability/acrosomal status (a measure of the sperm’s health and ability to fertilize an egg).
• The researchers found that, following the thawing process, progressive motility in the DMA group was higher than in the DMSO, EG, and GLY groups. This indicates that the DMA helped to better preserve the sperm’s ability to move and hence their overall functionality when compared to the other cryoprotectors.
• Additionally, the number of viable acrosome-intact spermatozoa was higher when using DMA in comparison with DMSO. This means that DMA was more effective in maintaining the health and fertilization capability of the sperm cells.
• However, when comparing differences in cryoprotectant concentrations for any of the agents (3%, 4%, or 5%), they found no significant disparities.

Conclusions of the Study

• The study concludes that DMA appears to be a good cryoprotectant agent. It was more effective in preserving Peruvian Paso horse stallion semen compared to other agents such as DMSO, EG, and GLY.
• Interestingly, the concentration variation (3%, 4%, and 5%) seemed to have no impact on the effectiveness of these agents indicating that the choice of DMA over other agents is potentially a transposable result to other concentrations.