Equine blastocyst production under different incubation temperatures and different CO2 concentrations during early cleavage.

The research article delves into the optimal conditions for horse embryo development in a lab setting, focusing on parameters like temperature and carbon dioxide (CO2) concentration. It concludes that embryos can effectively mature at temperatures between 37.2 to 38.2 degrees Celsius, while their early development stages are considerably affected by minor adjustments in CO2 levels or the acidity of their surroundings.

Objective of the study

• The main goal of this research was to identify the ideal temperature and CO2 concentration needed for the maturation and early developmental stages of horse embryos in invitro (test tube) conditions.

Methodology

• The study first looked at the maturation rates of embryos at temperatures of 37.2°C, 37.7°C or 38.2°C.
• After evaluating the maturation rates, the researchers analyzed the cleavage rates (a vital part of cell division) and blastocyst rates (early-stage embryos) at these temperatures.
• Next, the study shifted its focus towards the effect of different CO2 concentrations (6%, 6.5% or 7% CO2) in 5% oxygen on the embryos. This was performed over five days after the sperm injection, in a commercial human embryo medium supplemented with serum, at 38.2°C.
• The acidity levels of these mediums were also recorded.

Findings

• Results showed no significant differences in maturation, cleavage, and blastocyst rates at the tested temperatures, indicating that the invitro production of horse embryos is effective within a range of 37.2-38.2°C.
• In the varying concentrations of CO2, however, there were noticeable differences. The blastocyst rate at 7% CO2 was significantly lower than at 6.5% CO2, suggesting sensitivity to minor alterations in the CO2 environment or the medium’s pH levels during the early cleavage stage of the embryos.

Conclusion

• The research concluded that while the invitro production of horse embryos can be efficiently executed in a temperature range of 37.2-38.2°C, the early developmental stages following cell division are sensitive to changes in CO2 concentration or changes in the surrounding medium’s acidity.