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首页> 外文学位 >Effect of ambient temperature on duration of gestation and changes in rumen temperature at parturition and estrus in fall calving beef cows
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Effect of ambient temperature on duration of gestation and changes in rumen temperature at parturition and estrus in fall calving beef cows

机译：环境温度对秋季犊牛母牛分娩期和发情期妊娠时间和瘤胃温度变化的影响

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摘要

Scope and method of study. Effect of ambient temperature on duration of gestation was evaluated in 24 fall calving Angus x Hereford cows during 2 yr. Cows were blocked according to age and AI to calve in August or October in yr 1. Cows were blocked according to age and AI to calve in mid August, late August, September, or October in yr 2. Plasma samples were taken for 2 wk prior to calving and concentrations of progesterone, cortisol and estradiol were assayed by RIA. Rumen temperature was recorded hourly at parturition and estrus in yr 2.;Findings and conclusions. Cows exposed to elevated ambient temperatures during the last 2 wk of gestation have a shorter (P < 0.05) duration of gestation compared with cows not exposed to elevated ambient temperatures at this time. Concentrations of progesterone and estradiol in plasma are not altered by elevated ambient temperature. Concentrations of cortisol in plasma may be altered by exposure to elevated ambient temperatures. Rumen temperature decreases ≥ 0.3 °C the day before parturition in fall calving beef cows. Rumen temperature increases ≥ 0.3 °C at onset of estrus compared to the same daily hours on the day before onset of estrus. The change in rumen temperature can be used to predict parturition and estrus in beef cows.
机译：研究范围和方法。在2年中，对24头秋天产犊的安格斯x赫里福德奶牛评估了环境温度对妊娠持续时间的影响。在1年的8月或10月根据母牛的年龄和AI进行犊牛的饲养。在2年的8月中旬，8月下旬，9月或10月根据母牛的年龄和AI犊牛的饲养2周进行血浆采样。产犊前，通过RIA测定孕酮，皮质醇和雌二醇的浓度。在第2年每小时在分娩和发情时记录瘤胃温度；发现和结论。与此时未暴露于升高的环境的母牛相比，在妊娠的最后两周暴露于升高的环境的母牛的妊娠持续时间较短（P <0.05）。升高的环境温度不会改变血浆中孕酮和雌二醇的浓度。血浆中皮质醇的浓度可通过暴露于升高的环境温度中而改变。秋季产犊的母牛的前一天瘤胃温度下降≥0.3°C。与发情前一天的同一小时相比，发情时瘤胃温度升高≥0.3°C。瘤胃温度的变化可用于预测肉牛的分娩和发情。

著录项

  • 作者

    Wright, Elane Courtney.;

  • 作者单位

    Oklahoma State University.;

  • 授予单位 Oklahoma State University.;
  • 学科 Animal sciences.
  • 学位 M.Agr.
  • 年度 2009
  • 页码 84 p.
  • 总页数 84
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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