Division of Animal Sciences, University of Missouri, Columbia, MO 65211, USA.
Vet Clin North Am Food Anim Pract. 2013 Nov;29(3):591-617. doi: 10.1016/j.cvfa.2013.07.009. Epub 2013 Sep 5.
Expanded use of artificial insemination (AI) and/or adoption of emerging reproductive technologies for beef heifers and cows require precise methods of estrous-cycle control. New protocols for inducing and synchronizing a fertile estrus in replacement beef heifers and postpartum beef cows in which progestins are used provide new opportunities for beef producers to synchronize estrus and ovulation and to facilitate fixed-time AI. This article reviews the various estrous synchronization protocols currently available for use in replacement beef heifers. New methods of inducing and synchronizing estrus now create the opportunity to significantly expand the use of AI in the United States cowherd.
扩大家庭人工授精（AI）和/或采用新兴生殖技术对肉牛小母牛和母牛的需求需要精确的发情周期控制方法。用于诱导和同步替代肉牛小母牛和产后肉牛发情的新方案中使用孕激素，为肉牛生产者提供了同步发情和排卵的新机会，并促进了定时 AI。本文综述了目前在替代肉牛小母牛中使用的各种发情同步方案。诱导和同步发情的新方法现在为在美国牛群中显著扩大 AI 的使用创造了机会。
