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模拟热应激对加拿大荷尔斯坦乳牛初次服务到受孕率的影响

G R Dodd¹, F Miglior², F S Schenkel¹

¹Centre for Genetic Improvement of Livestock, Department of Animal Biosciences, University of Guelph, Guelph, ON, Canada.

Journal of dairy science

|October 23, 2025

概括

热应激显著影响奶牛的生育能力,怀孕延迟开始在66的温度湿度指数 (THI) 以上. 定时人工授精协议比热检测方法对热负荷更敏感.

科学领域:

乳牛的繁殖乳牛的繁殖
环境压力生理学生理学
畜牧业管理畜牧业管理

背景情况:

热应激 (HS) 对乳牛产量和生育能力产生负面影响.
了解影响生育能力的特定温度湿度指数 (THI) 值对行业至关重要.
从第一次服务到怀孕的间隔 (FSTC) 是生育能力表现的关键指标.

研究的目的:

确定FSTC因加拿大乳牛的HS增加的THI值.
评估雌激素同步协议对HS生育值的影响.
确定加拿大的地理区域,从HS对乳制品生育能力的影响面临风险.

主要方法:

利用了来自加拿大Holsteins的2,033,928个FSTC记录的大量数据集 (平价1-3).
使用NASA POWER的每小时温度和湿度数据计算每日THI.
应用了细分线性回归来确定HS值,并分析了定时AI与热检测效应.

主要成果:

增加FSTC的关键THI值被确定为66,特别是围绕授精的3天窗口.
定时人工授精 (AI) 协议显示,与热检测 (值72.8) 相比,对HS (值64) 的敏感性更高.
安大略省被确定为一个令人担忧的省份,经常经历夏季THI高于66.

结论:

66的THI代表了影响乳牛生育能力的重要门,特别是FSTC.
雌激素同步方法,特别是定时人工智能,更容易受到热应激对生育能力的影响.
像安大略省这样的地区需要有针对性的管理策略,以减轻HS对乳制品繁殖的影响.

关键词:

雌激素同步的同步性生育能力生育能力生育能力生育能力首先服务于概念的概念.热应激是一种热应激.

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Thermal Stress

Thermal Stress

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