VIABLE OOCYTE PRODUCTION RATE, EMBRYO TURNAROUND AND PREGNANCY RATE, IN NELORE P.O AND NELORE CEIP

Abstract

Brazilian livestock has established itself as a global reference, driven by advancements in reproductive biotechnologies and the genetic improvement of the cattle herd. The use of techniques such as fixed-time artificial insemination (TAI), fixed-time embryo transfer (TETF), and in vitro embryo production (IVEP) has significantly accelerated genetic progress in meat and milk production. The study compared the reproductive efficiency of the Nelore CEIP and Nelore P.O. lines in three farms located in Minas Gerais. The results indicated that the Nelore P.O. presented higher rates of oocyte conversion into embryos, reaching 47.70% and 67.27%, while the Nelore CEIP obtained 40.05%. In addition, the P.O strain showed a lower rate of discarding non-viable oocytes, evidencing its greater genetic homogeneity and superior quality. These findings highlight the relevance of selecting genetically superior animals, such as the Nelore P.O., in assisted reproduction programs, contributing to greater production efficiency, genetic quality, and sustainability. Thus, continuous investment in reproductive biotechnologies and strict genetic selection criteria is essential for the competitiveness and sustainable growth of Brazilian livestock.