Abstract：
The article discusses the importance of reproductive biotechnologies, including artificial insemination and fixed-time artificial insemination (TAI), in beef cow-calf operations. The use of TAI improves cow-calf productivity and profitability by shortening the breeding season and increasing the number of calves born earlier, resulting in heavier calves at weaning. However, adoption of TAI by beef producers in the United States has been slow compared with the dairy industry and internationally, such as Brazil. Current TAI protocols are effective in synchronizing ovulation and yield consistent pregnancy results. Factors affecting the success of TAI include cow/heifer factors, sire, nutritional status, and cattle temperament.
摘要：
本文讨论了生殖生物技术的重要性，包括人工授精和固定时间人工授精（TAI），在肉牛小牛手术中。TAI的使用通过缩短繁殖季节和增加较早出生的小牛数量，提高了小牛的生产力和盈利能力，导致断奶时较重的小牛。然而,与乳制品行业和国际上相比，美国牛肉生产商采用TAI的速度很慢，比如巴西。当前的TAI方案在同步排卵和产生一致的妊娠结果方面是有效的。影响TAI成功的因素包括奶牛/小母牛因素，陛下,营养状况,和牛的气质。
