...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of dairy science >Comparative Reproductive Performance and Early Lactation Productivity of Jersey × Holstein Cows in Predominantly Holstein Herds in a Pasture-Based Dairying System
【24h】

Comparative Reproductive Performance and Early Lactation Productivity of Jersey × Holstein Cows in Predominantly Holstein Herds in a Pasture-Based Dairying System

机译：基于牧场的奶牛场中主要荷斯坦奶牛场的泽西×荷斯坦奶牛的繁殖性能和早期泌乳生产力的比较

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

The aim of this study was to compare the reproductive performance, milk production, live weight, and body condition loss during early lactation of purebred Holstein (H) cows to Jersey × H (J × H) crossbred cows in 4 Victorian herds. Cows of H and J × H breeding were managed together within each herd, and all herds had a seasonally concentrated calving pattern that commenced in early spring (July). All crossbred cows included in the study were 25, 50, or 75% H and were considered collectively as J × H regardless of the sire and dam breeds used to reach those percentages. Each herd owner provided records of reproductive performance and milk production. Compared with H cows, J × H cows had higher first-service conception rates (52 vs. 42%), higher percentages confirmed pregnant by 6 (68 vs. 54%) and 14 wk (86 vs. 78%) after the first day of inseminating, and lower final not-in-calf rates (11 vs. 16%); however, these differences were not observed in all herds. A random selection of H and J × H cows had body condition assessed on 3 occasions between the start of calving and the first day of the artificial insemination program. The selected cows were also weighed on the final occasion. Overall, body condition scores were slightly higher for J × H cows than for H cows, but changes in body condition score between calving and the start of inseminating were similar between breed groups. The H cows were 40 kg heavier than J × H cows and had daily milk yields in early lactation that were 2.2 kg higher. Daily yields of milk fat and protein did not differ between H and J × H cows during the study period. The improved reproductive performance of J × H cows compared with H cows may render them more suitable for use in dairy herds with seasonally concentrated calving patterns. Their improved reproductive performance was not as-rnsociated with differences in condition loss in early lactation.
机译：这项研究的目的是比较纯种荷斯坦（H）奶牛与泽西×H（J×H）杂种奶牛在4个维多利亚时代的牛群的早期泌乳期间的繁殖性能，产奶量，活体重和身体状况损失。 H和J×H育种的奶牛在每头牛群中一起管理，所有牛群的季节性产犊模式始于早春（7月）。研究中包括的所有杂交母牛的H，H分别为25％，50％或75％，无论用于达到这些百分比的父系和大坝品种，都被统称为J×H。每个牧群所有人都提供了生殖性能和产奶量的记录。与H母牛相比，J×H母牛的初次受孕率更高（52对42％），首次怀孕后确认怀孕的比例更高（6对（68对54％）和14周（86对78％））。授精的天数和较低的最终非犊牛发生率（11比16％）；但是，并非所有牧羊都观察到这些差异。从产犊开始到人工授精计划的第一天之间，随机选择了3头H和J×H母牛的身体状况。最后一次对选定的母牛进行称重。总体而言，J×H母牛的身体状况得分略高于H母牛，但是在产犊和开始授精之间的身体状况得分变化在不同品种组之间相似。 H型奶牛比J×H型奶牛重40公斤，泌乳早期的日产奶量高2.2公斤。在研究期间，H和J×H奶牛的每日乳脂和蛋白质产量没有差异。与H母牛相比，J×H母牛的生殖性能提高，可能使其更适合于季节性集中产犊模式的奶牛场。他们提高的生殖性能与早期哺乳期条件丧失的差异没有关系。

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