新疆褐牛体重与体尺指标的相关及回归分析

Correlation and regression analysis on body mass and body size index of Xinjiang brown cattle

为探讨新疆褐牛体重与体尺指标间的相关性及构建不同生长阶段的回归方程,为新疆褐牛选育提供直接而有效的方法,以伊犁地区2011—2019年6月龄、12月龄、18月龄、24月龄新疆褐牛为对象,测定4个生长阶段的4个体尺指标和体重并进行相关性分析和逐步线性回归分析。新疆褐牛不同生长阶段体重和体尺指标间存在着极显著的(P<0.01)相关性,12月龄的体尺指标与体重的相关性较其他生长阶段更高,其他体尺指标间也存在着极显著相关性(P<0.01)。通过新疆褐牛不同生长阶段估测体重的回归模型,得到了6月龄、12月龄、18月龄、24月龄4个阶段的最优回归方程,其决定系数分别为0.60、0.63、0.55和0.44,说明各阶段体重与体尺指标存在着显著的线性关系。对不同生长阶段体重与体尺指标进行相关性及回归分析,构建了不同生长阶段的4个线性回归方程,对新疆褐牛选育具有重要的意义。

The experiment was conducted to explore correlation between body mass and body size and constructed regression equation for different growth stages in Xinjiang brown cattle,so as to provide an effective and direct method for Xinjiang brown cattle breeding.Four individual size indexes and body weight in 4 growth stages(6 months,12 months,18 months and 24 months)of Xinjiang brown cattle were measured and the correlation analysis and stepwise linearity regression analysis were performed in Yili area.There was a significant correlation between body weight and body size for different growth stages of Xinjiang brown cattle(P<0.01),the correlation between body size indexes and body weight was higher than others growth stage at 12 months old,and other body size indexes also showed a significant correlation(P<0.01).By the regression models estimating body mass for different growth stages of Xinjiang brown cattle,the optimal regression equations and the coefficients were 0.60,0.63,0.55 and 0.44,which indicated that there was a significant linear relationship between body weight and body size index in each stage.The correlation and regression analysis had constructed 4 linear regression equations for different growth stages of body mass and body weight,which was of great significance to Xinjiang brown cattle breeding in practice.