Transferencia de embriones en fresco, en vaconas lecheras, utilizando dos protocolos hormonales de inseminación artificial a tiempo fijo, adicionando eCG y sin adicionar eCG

The study on bovine follicular dynamics and embryo transfer seeks to optimize reproductive efficiency in dairy cattle. The application of hormones in fixed-time artificial insemination (FTAI) protocols allows improving pregnancy rates and embryo quality, contributing to the advancement of reproductive biotechnologies. General Objective: Determine the effect of the addition of eCG in an IATF hormonal protocol on the size of the corpus luteum and pregnancy rates in recipient cows. Methodology: An experimental design was used with 20 dairy cows divided into two groups, with and without administration of eCG. Gynecological check-ups, estrus synchronization and embryo transfer were performed. Data collection included measurements of the corpus luteum and pregnancy diagnosis by ultrasound. Results: The protocols with eCG showed greater synchronization of estrus, a more developed size of the corpus luteum and a significant increase in the pregnancy rate compared to the protocols without this hormone. Conclusions: The use of eCG in IATF protocols improves reproductive efficiency by promoting follicular maturation and increasing pregnancy rates. The proper selection of donors and recipients is essential for the success of the procedure.