肉牛双胎生产技术实践OA

To investigate the practical application of twin technology in large-scale beef cattle farming,a total of 110 Simmental recipient cows were treated with estrus synchronization using a protocol combining a controlled internal drug release(CIDR)device,prostaglandin(PG),and vitamin AD for embryo transfer in two ranches of A and B.The study focused on evaluating the effects of corpus luteum(CL)quality and embryo transfer site(ipsilateral vs.contralateral to the CL)on the rate of twin pregnancies.The results showed that the estrus rate was 90%,the rate of recipients with a qualified CL was 69%,the overall pregnancy rate was 74%,and the twin pregnancy rate reached 78%.Recipient cows with embryos transferred to the uterine horn contralateral to the CL achieved twin pregnancy rates(ranch A:88%,ranch B:86%)significantly higher than those receiving ipsilateral transfers(ranch A:63%,ranch B:67%)(P＜0.05).The study suggested that twin technology would effectively enhance reproductive efficiency and economic returns in beef cattle production by optimizing recipient selection,hormonal regulation and transfer procedures.