Abstract

In vivo embryo transfer was carried out in crossbred Brown Swiss cows from the influential provinces of National Toribio Rodriguez de Mendoza University (UNTRM) experimental stations, from the beginning of the autumn season of 2013 to the end of spring season of 2015, for which states of transfers. Transfers were used mainly in receptors crossbred Brown Swiss cows, with a population of 126 receptors cows aged 2 to 9 years with a number of births ranging from 0 to 7, of which 74 transfers were performed with embryos fresh and 52 with frozen embryos. After 28 to 35 days of transfer of the embryo, gestation was evaluated by ultrasonography. With the objective of obtaining a pregnancy rate by state and the totality of the transfers, they were evaluated with the ANDEVA technique with a statistical significance of 5%. Obtaining that the pregnancy rate presented a significant statistical variation due to factors like the station and the state (fresh or frozen). Likewise, the value of total embryo transfer was 46.0%, while embryo transfer in the fresh and frozen state was 54.1% and 34.6%, respectively, and it was considered successful.

Keywords

embryos, transfer, donors, receptors, superovulation, pregnancy rates, quantity, availability, economic viability, reproductive efficiency, meat quality, pastures and forages, cattle ranching, population size, generation technology