12月龄短角牛体重与主要体尺指标的相关性分析

本文旨在探究12月龄短角牛体重与主要体尺指标之间的相关性，构建多元回归方程，研究影响短角牛的主要体尺指标及月龄。选取12月龄公牛163头，母牛261头，共424头短角牛体重、体高、十字部高、体斜长、胸围的体尺数据，使用最小二乘法对已知数据进行最佳线性拟合，构建多元回归方程并分析其相关性。结果显示，12月龄短角公牛的体重与各体尺指标的平均值均高于母牛；且体重与各体尺指标的回归关系达到极显著水平（p﹤0.01），多元线性回归方程拟合度较高。12月龄短角牛无论公母，其体重与各体尺指标之间均呈现不同程度的相关性, 其中公牛的体高、十字部高、体斜长、胸围与体重的相关性高于母牛。12月龄短角公牛体重与体高、十字部高、体斜长、胸围呈极显著正相关（p﹤0.01），其中体重与胸围的相关性最大(r=0.902)。12月龄短角母牛的体重与体高、十字部高、体斜长、胸围之间均呈极显著正相关（p﹤0.01），其中与胸围相关性最大(r=0.823)。12月龄短角牛的体重与体高、十字部高、体斜长、胸围之间均呈极显著正相关（p﹤0.01），其中与胸围相关性最大(r=0.873)。

Correlation analysis between body weight and main body size indexes of 12-month-old shorthorn cattle

The purpose of this paper is to explore the correlation between body weight and main body size indexes of 12-month-old shorthorn cattle, and to construct a multiple regression equation to study the main body size indexes and age of shorthorn cattle. A total of 163 bulls and 261 cows at 12 months of age were selected, and a total of 424 shorthorn cattle were selected for body size data of body weight, body height, cross height, body oblique length and chest circumference. The least square method was used to perform the best linear fitting of the known data, and the multiple regression equation was constructed and its correlation was analyzed. The results showed that the average body weight and body size indexes of 12-month-old bulls were higher than those of cows. The regression relationship between body weight and each body size index reached a very significant level ( p < 0.01 ), and the multiple linear regression equation had a high degree of fitting. There were different degrees of correlation between body weight and body size indexes of 12-month-old shorthorn cattle, regardless of male or female. The correlation between body height, cross height, body oblique length, chest circumference and body weight of bulls was higher than that of cows. The body weight of 12-month-old short-horned bulls was significantly positively correlated with body height, cross height, body length and chest circumference ( p < 0.0 ). The correlation between body weight and chest circumference was the highest ( r = 0.902 ). The body weight of 12-month-old shorthorn cows was significantly positively correlated with body height, cross height, body length and chest circumference ( p < 0.01 ), and the correlation with chest circumference was the largest ( r = 0.823 ). The body weight of 12-month-old shorthorn cattle was significantly positively correlated with body height, cross height, body length and chest circumference ( p < 0.01 ), and the correlation with chest circumference was the largest ( r = 0.873 ).