首页> 外文OA文献 >Relationships between Body Weight and Milk Yield During the Early Postpartum Period and Bull and Technician and the Reproductive Performance of High Producing Dairy Cows
【2h】

Relationships between Body Weight and Milk Yield During the Early Postpartum Period and Bull and Technician and the Reproductive Performance of High Producing Dairy Cows

机译:产后早期体重与产奶量的关系及公牛技术人员与高产奶牛的繁殖性能

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务,本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文,但由于OA文献来源多样且变更频繁,仍可能出现获取不到、文献不完整或与标题不符等情况,如果获取不到我们将提供退款服务。请知悉。

摘要

The aim of this study was to evaluate the effect of body weight (BW) change during the early postpartum period and BW on day 50 post partum on the subsequent expression of estrus and fertility at first insemination before day 90 post partum. The data were derived from 1036 postpartum cows reaching 90 days in milk. The following data were recorded for each animal: lactation number, daily milk production at day 50 post partum, calving date, days in milk at estrus and at AI, insemination date, insemination number, inseminating bull, AI technician and body weight at calving, at day 50 post partum and at AI. Of the 1036 cows registered, 817 (78.9%) showed first estrus before day 90 post partum and were inseminated. Using logistic regression procedures and based on the odds ratio a one unit (kg) increase in the daily milk production at day 50 post partum and a one unit (kg) decrease in the BW between calving and day 50 post partum were related to a 1.03-fold increase and a 0.97-fold decrease in the estrus expression rate before day 90 post partum, respectively. Of the 817 cows inseminated before day 90 post partum, 437 became pregnant (53.5%). A one unit increase in the BW at day 50 post partum produced a 1.003-fold increase in the early fertility rate. Pregnancy rate before day 90 was also influenced by the season at calving, bull providing semen and technician. In conclusion, the register of BW during the postpartum period may be a useful tool for evaluating the nutritional status and its relationship with the subsequent reproductive efficiency in dairy cows.
机译:这项研究的目的是评估产后早期体重变化和产后第50天体重变化对产后第90天之前首次授精后发情和生育力表达的影响。数据来自1036头产奶90天的产后母牛。记录每只动物的以下数据:泌乳次数,产后第50天的每日产奶量,产犊日期,发情期和AI的产奶天数,授精日期,授精数,授精的公牛,AI技术员和产犊时的体重,产后第50天和AI。在登记的1036头母牛中,有817头(78.9%)在产后90天之前表现出第一次发情并进行了授精。使用逻辑回归程序并基于比值比,在产后第50天和产后第50天之间,每日产奶量增加1单位(kg),而产犊后BW降低1单位(kg)。产后第90天,发情表达率分别增加了3倍和减少了0.97倍。产后90天前授精的817头母牛中,有437头怀孕(53.5%)。产后第50天体重增加一个单位会使早期生育率增加1.003倍。第90天之前的怀孕率也受产犊季节,公牛提供精液和技术人员的影响。总之,产后体重指数可能是评估奶牛营养状况及其与随后生殖效率关系的有用工具。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

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