• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Tropical Animal Health and Production >Effects of energy supplementation on productivity of dual-purpose cows grazing in a silvopastoral system in the tropics
【24h】

Effects of energy supplementation on productivity of dual-purpose cows grazing in a silvopastoral system in the tropics

机译：补充能量对热带牧草系统中放牧的两用奶牛生产力的影响

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 the present work was to evaluate milk yield, postpartum (pp) ovarian activity and pregnancy rate in dual-purpose cows grazing and browsing with or without energy supplementation. Twenty-four x cows were divided in two groups from calving to 70 days post-calving: supplemented group (SG) with ground sorghum grain offered at 0.4% of live weight at calving and control group (CG) without supplement. There was a trend for milk yield (kg day(-1)) to be greater ( = 0.08) for SG (10.55 +/- 0.51) compared to CG (9.53 +/- 0.61), although without differences in fat (0.42 +/- 0.02 vs. 0.38 +/- 0.03 kg day(-1)), protein (0.29 +/- 0.02 vs. 0.29 +/- 0.02 kg day(-1)) or lactose (0.49 +/- 0.02 vs. 0.49 +/- 0.03 kg day(-1)) concentration. Populations of large, medium and small follicles were similar between treatments. Percentage of cows which showed corpus luteum tended to be greater in SG (50%), compared to CG (33%). Supplemented cows tended to have a shorter calving-first corpus luteum interval (40 +/- 10 vs. 51 +/- 10 days) and had a significantly higher ( (2) = 0.03) pregnancy rate (42% vs. 0%). It is concluded that energy supplementation helped to improve ovarian activity and pregnancy rate. Since supplementation did not avoid loss of body condition, the higher pregnancy rate in SG suggests beneficial effects of supplementation probably mediated by metabolic hormones.
机译：本研究的目的是评估在有或没有补充能量的情况下放牧和浏览的两用奶牛的产奶量，产后（pp）卵巢活动和妊娠率。从产犊到产犊后70天，将24头x母牛分为两组：补充组（SG），提供产犊时活重的0.4％的高粱粉，而对照组（CG）不补充。与CG（9.53 +/- 0.61）相比，SG（10.55 +/- 0.51）的牛奶产量（kg day（-1））有更大的趋势（= 0.08），尽管脂肪（0.42 + /-0.02 vs. 0.38 +/- 0.03 kg day（-1）），蛋白质（0.29 +/- 0.02 vs.0.29 +/- 0.02 kg day（-1））或乳糖（0.49 +/- 0.02 vs. 0.49 +/- 0.03千克日（-1））浓度。不同处理之间大，中，小卵泡的种群相似。与CG（33％）相比，SG（50％）表现出黄体的母牛比例趋于更大。补充奶牛的产犊优先黄体间隔通常较短（40 +/- 10 vs. 51 +/- 10天），并且妊娠率明显更高（（2）= 0.03）（42％vs. 0％） 。结论是补充能量有助于改善卵巢活动和妊娠率。由于补充不能避免身体状况的丧失，因此SG中较高的妊娠率提示补充可能是由代谢激素介导的有益作用。

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