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在子宫内,热应激会影响整个身体的生长和乳腺发育,从断奶后到青春期

Brittney D Davidson¹, Sena L Field¹, Bethany Dado-Senn¹

¹Department of Animal and Dairy Sciences, University of Wisconsin-Madison, Madison, WI 53706.

Journal of dairy science

|May 11, 2025

概括

在子宫内,热应激会对母牛生长和乳腺发育产生负面影响,导致卵巢功能发生改变. 这些影响持续到近青春期,可能解释了晚年牛奶产量减少的原因.

科学领域:

生殖生理学生殖生理学
动物科学动物科学
发展生物学发展生物学

背景情况:

晚期孕期热应激会降低母牛的小牛生长和未来的牛奶产量.
在子宫内热应激对周围青春期小牛的延续效应尚不清楚.

研究的目的:

研究子宫内热应激对近青春期小牛体生长,乳腺发育和卵巢功能的长期影响.

主要方法:

雌牛在怀孕晚期暴露于冷却或热应激.
身体测量,乳腺宏观结构和血液样本每月从3到12个月收集一次.
激素水平,乳腺微观结构和卵巢结构在周围青春期被分析.

主要成果:

在子宫内,受热应激的母牛体重量,身高和胸围都降低了.
乳腺发育受损,乳头较短,整体长度减少.
卵巢功能发生改变,表现出较小的主导卵泡和黄体,并降低了雌激素水平.

结论:

在子宫内热应激对母牛的发育和生殖功能有持久的负面影响.
在近青春期中乳腺卵巢交叉干扰可能是未来哺乳性能降低的基础.

关键词:

雌二醇是雌二醇的一种药物.过热症过热症是什么?卵巢超声波检查结果青春期的青春期,就是青春期.

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