中国荷斯坦奶牛肛殖距与产奶性能的相关性研究

Correlation Research between Anogenital Distance and Milk Production Performance in Chinese Holstein Dairy Cattle

【目的】阐明中国荷斯坦奶牛肛殖距的分布规律,探索其与体尺、线性等表型指标及奶牛产奶量的相关性,为中国荷斯坦奶牛的个体选育及奶牛群体品质提高提供理论依据。【方法】收集四川柠刚奶牛场2017—2021年档案记录的782头母牛的表型指标和各胎次产奶量,使用SPSS 27.0对其进行正态分布检验、单因素方差分析及相关性分析。【结果】中国荷斯坦奶牛的肛殖距呈现正态分布规律,且不会随着年龄变化而发生显著变化。中国荷斯坦奶牛肛殖距与胸围呈显著正相关(P<0.05),与各个胎次的产奶量呈负相关关系,且随着肛殖距的增加,第一、三胎次的产奶量显著降低(P<0.05)。【结论】肛殖距与奶牛的产奶性能有相关性,可以作为选育高产奶牛的候选性状。

[Objective] This study aimed to elucidate the distribution rule of anogenital distance of Chinese Holstein dairy cattle, and explore its correlation with phenotypic indexes such as body size, linearity and milk yield of dairy cows, so as to provide theoretical basis for individual breeding and herd quality improvement of dairy cows.[Method] The phenotypic data of phenotypic indexes from 782 cows and the milk yield of each parity were recorded in the 2017—2021 archives of Sichuan Ninggang Dairy Farm.The normal distribution test,single factor analysis and correlation analysis were performed by SPSS 27.0.[Result] The anogenital distance showed a normal distribution and did not change significantly with the age.The anogenital distance was positively correlated with the breast circumference of dairy cows(P<0.05),and negatively correlated with the milk yield of each parity.With the increase of the anogenital distance,the milk yield of the first and third parity decreased significantly(P<0.05).[Conclusion] It can be concluded that the anogenital distance is related to the milk production performance of dairy cows,and can be used as a candidate trait for breeding high-yielding dairy cows.