Comparative assessment of the cattle embryo survival rate efficiency depending on meat and dairy productivity of recipients

The purpose of the study is to determine the effectiveness of embryo engraftment in cows-recipients of meat and dairy productivity. The paper provides data on work with cows selected as recipients for gestation of embryos obtained from donor cows of the Aberdeen Angus breed. All embryos were obtained from Center for Reproductive Technologies LLC (Samara Region). Research work on embryo transfer was carried out at JSC Agro-Industrial Firm Nasha Zhitnitsa in the Smolensk Region. Outbred cows (n = 110) were selected as experimental animals, which were divided into two groups during the study. Group I included animals (n = 37) that were phenotypically similar to beef cattle, and group II (n = 73) included cows that were phenotypically similar to dairy cattle. It was found that during ultrasound diagnostics of the reproductive organs on the 25th day after embryo transfer, pregnancy was noted in group I in 70.3 % (26/37) of animals, and in group II - in 50.7 % (37/73) animals respectively. The results obtained reliably (P ≤ 0.01) demonstrate that in recipients selected from among beef cows, the results of embryo engraftment on the 32nd day of pregnancy were higher than in dairy cows by 19.6 %, and when diagnosing pregnancy on 60th day - by 22.3 %. Based on the data obtained, we can conclude that beef cows have greater reproductive potential as recipients than dairy cows.