高温湿度指数与韩国乳制品系统中的牛奶性能和质量之间的负相关性:大数据分析
Dongseok Lee1, Daekyum Yoo1, Hyeran Kim2
1Department of Animal Science, Life and Industry Convergence Research Institute, Pusan National University, Miryang 50463, Korea.
Journal of animal science and technology
|June 19, 2023
概括
热应激对韩国的奶牛产生负面影响,减少牛奶产量,增加牛奶尿素 (MUN) 和体细胞评分 (SCS),当温度湿度指数 (THI) 超过70时.
科学领域:
- 动物科学动物科学
- 乳牛研究 乳牛研究
- 牲畜中的环境压力因素
背景情况:
- 热应激是奶牛养殖的一个重大挑战,影响动物健康和生产力.
- 了解环境条件对牛奶特征的具体影响对于乳制品管理至关重要.
研究的目的:
- 为了研究热应激对韩国荷尔斯坦牛的各种牛奶特征的影响,用温度湿度指数 (THI) 测量.
- 确定关键的THI值 (突破点),在此时,牛奶特征受到显著影响.
主要方法:
- 利用了1,498,232个测试日记录的综合数据集,来自2,419个韩国牛群中的215,276只霍尔斯坦牛.
- 将乳制品生产数据与气象数据合并,并应用细分回归和通用线性模型来分析THI效应.
- 确定最小平方的意思是牛奶的特征,考虑诸如地区,分娩季节,平价和牛奶中的天数等因素.
主要成果:
- 在所有分析的牛奶特征中观察到THI的显著断点 (BP).
- 牛奶生产参数 (产量,脂肪和蛋白质校正的牛奶,脂肪产量,蛋白质产量) 在THI BP之后显著下降.
- 当THI超过BP时,乳尿素 (MUN) 和体细胞得分 (SCS) 显著增加,特别是在原生母牛中.
结论:
- 在韩国,当THI超过70时,乳牛对牛奶特征产生不利影响.
- 有效的养管理策略对于减轻热应激及其对乳制品生产的负面影响至关重要.
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