...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Animal Science >Physiological, health, lactation, and reproductive traits of cooled dairy cows classified as having high or low core body temperature during the dry period
【24h】

Physiological, health, lactation, and reproductive traits of cooled dairy cows classified as having high or low core body temperature during the dry period

机译：冷却乳制奶牛的生理，健康，哺乳和生殖特性，在干燥期间归类为具有高或低核心体温的核心体温

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

Primary objectives of this study were to compare concentrations of pregnancy-associated glycoprotein (PAG) before calving, prolactin (PRL) after calving, and energy balance indicators before and after calving in cooled cows classified as having high (HT) or low (LT) core body temperature (CBT) during the dry period. Secondary objectives were to investigate associations between dry-period CBT and likelihood of cows developing health disorders, and compare health, productive and reproductive traits of HT and LT cows. Dry Holstein cows (n = 260) with 250 to 260 d of gestation from three herds were enrolled in the study during summer. Cows were provided evaporative cooling during the dry and lactating period. The vaginal temperature was recorded in 5 -min intervals during 7 consecutive days and cows were classified as HT or LT. Blood samples were collected weekly from enrollment until 14 3 d in milk (DIM). Additional blood samples were collected within 12 h postpartum from a subgroup of cows (n = 25) to determine PRL concentration. Cows were monitored for health disorders, productive, and reproductive performance until 13 wk of the subsequent lactation. High temperature cows had shorter (P < 0.01) gestation length (273.9 0.9 vs. 278.2 0.9 d) and greater (P < 0.01) incidence of twinning (19.7 vs. 4.2%) than LT cows. Cows classified as HT had greater (P = 0.02) PAG concentration (134.1 4.9 vs. 117.4 4.9 ng/mL), but postpartum PRL concentration did not (P = 0.55) differ between HT and LT cows. Primiparous HT cows had greater (P = 0.05) prepartum nonesterified fatty acids concentration (135, 95% CI = 102 to 178 vs. 104, 95% CI = 75 to 144 mmol/ dL) than primiparous LT cows, but no differences (P = 0.72) were observed between CBT group in multiparous cows. The concentration of il-hydroxybutyrate was greater (P = 0.04) for LT compared with HT cows at 7 3 DIM. The quadratic effect of CBT tended (P = 0.09) to be associated with risk of health disorders within 60 DIM. Milk yield tended (P = 0.10) to be greater for LT compared with HT cows (49.3 1.9 vs. 46.2 1.6 kg). Pregnancy per Al at first service did not (P = 0.64) differ between HT and LT cows. In conclusion, HT cows have distinct concentrations of PAG in late gestation and energy balance indicators during the transition period. In addition, CBT assessment during the dry period may be a useful tool to identify cows expected to have impaired health and milk yield in the subsequent lactation.
机译：本研究的主要目标是在产犊前比较妊娠相关的糖蛋白（PAG）的浓度，在加工后催乳素（PRL），在归类为具有高（HT）或低（LT）的冷却奶牛之前和后期和之后的能量平衡指示剂干燥期间核心体温（CBT）。次要目标是调查干燥期CBT和奶牛的可能性之间的协会，并比较HT和LT牛的健康，生产力和生殖特征。在夏季，在研究中，干燥Holstein牛（n = 260）患有250至260 d妊娠的妊娠。在干燥和泌乳期间提供牛奶蒸发冷却。在连续7天内以5-颗间隔记录阴道温度，奶牛被归类为HT或LT。每周收集血液样品，直至牛奶中的14例3d（暗淡）。在从奶牛的亚组（n = 25）的产后收集另外的血液样品以确定PRL浓度。监测奶牛的健康障碍，生产力和生殖性能，直到13周后的后续哺乳期。高温奶牛较短（P <0.01）妊娠长度（273.9 0.9与278.2 0.9d），更大（P <0.01）孪生的发生率（19.7 vs.2％）。归类为HT的奶牛具有较大（p = 0.02）PAG浓度（134.1 4.9与117.4 4.9 ng / ml），但产后PRL浓度没有（p = 0.55）在HT和LT奶牛之间有所不同。 Primiparous HT奶牛的预备（p = 0.05）预备脂肪酸脂肪酸浓度（135,95％Ci = 102-178，95％Ci = 75-144mmol / D1），但没有差异（p在多重牛的CBT组之间观察到= 0.72）。与73℃下的HT奶牛相比，LT的IL-羟丁酸酯的浓度较大（p = 0.04）。 CBT的二次效果（P = 0.09）与60次昏暗中的健康障碍风险有关。与HT奶牛相比，牛奶产量趋于（p = 0.10），与HT牛（49.3 1.9对46.2 1.6千克）更大。在第一次服务时每AL的怀孕（P = 0.64）在HT和LT奶牛之间有所不同。总之，在过渡期间，HT奶牛在后期妊娠和能量平衡指标中具有明显的PAG。此外，干燥期间的CBT评估可能是一个有用的工具，以识别预期的奶牛在随后的哺乳期中患者受到健康和牛奶产量受损。

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