Results of transplantation of embryos of the Simmental breed

Abstract

The selection of offspring from the desired sex can be one of the determining factors to increase the genetic progress and farmer´s profitability in either beef or dairy cattle. This study’s objective was to determine the impact of two approaches of artificial insemination on embryo-productivity and transplantation of cow embryos. We used as a model the symmental breed, bred in Kazakhstan’s Northeast region. The quantity and quality of embryos obtained by artificial insemination of donor cows with same-sex and ambisexual semen were evaluated. In particular, the study examined the embryo transfer process from artificial insemination of ambisexual semen, embryo transfer from cow donors, washing out, evaluation, and transfer to recipients.This study shows that ambisexual inseminationresulted in an average 61.3% more suitable embryos than same-sex insemination. Additionally, embryos from ambisexual fertilization are more likely to reach the early blastocyte stage (59.8±4.18%). Despite that, there is no change in the success of embryo transplantation. In summary, creating conditions close to natural ones improves the success rate of embryo transfer.