...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Cattle practice >Fixed-time AI programmes for beef and dairy cattle in Canada
【24h】

Fixed-time AI programmes for beef and dairy cattle in Canada

机译：加拿大牛肉和奶牛的固定时间AI计划

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Although oestrus detection is required for artificial insemination (AI), it has been done poorly in dairy cattle and is difficult in beef cattle. Thus, the benefits of AI are often not exploited. The physiology and endocrinology of the oestrous cycle and ovarian physiology in particular, can have a profound effect on the application of assisted reproductive technologies in cattle, but can be manipulated for the application of fixed-time artificial insemination (FTAI), or AI without the need for oestrus detection. Protocols that synchronise follicle growth, corpus luteum regression and ovulation, all of which are required for FTAI, have resulted in improved reproductive performance, because all animals are inseminated whether they are observed in oestrus or not. As a result, FTAI protocols have become an integral part of reproductive management in many dairy herds and have offered beef producers the opportunity to incorporate AI into their breeding programmes. Gonadotropin releasing hormone (GnRH)-based protocols are used commonly for FTAI in North America. Protocols that also include the use of a progestin device have resulted in high pregnancy rates in lactating dairy cows and suckled beef cows and improved pregnancy rates in heifers and acyclic beef cows. FTAI can also be incorporated into resynchronisation programmes, facilitating early rebreeding of animals that fail to conceive, and eliminating the need for oestrus detection completely, or the use of bulls.
机译：虽然人工授精（AI）所需的休闲术检测，但它在奶牛中做得很差，并且在牛肉中很难。因此，AI的益处通常不会被利用。特别是令人讨厌的生理学和卵巢生理学的生理学和内分泌学，对辅助生殖技术在牛中的应用可能具有深远的影响，但可以操纵用于运用定时人工授精（FTAI），或没有AI的应用需要休闲检测。同步卵泡生长，语料库黄色回归和排卵的方案，所有这些都是FTAI所必需的，导致生殖性能提高，因为所有动物是否被遗留在发情症中。因此，FTAI协议已成为许多乳制品牛群生殖管理的一个组成部分，并提供了牛肉生产商有机会将AI纳入其繁殖计划。基于促胆量释放激素（GNRH）的协议通常用于北美的FTAI。还包括使用孕激素装置的方案导致哺乳酸奶牛和牛肉奶牛的高妊娠率，并改善了小母牛和无循环牛奶的妊娠率。 FTAI也可以纳入重新同步计划，促进未经怀疑的动物的早期释放，并完全消除对雌期发情的需求，或者使用公牛。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号