苏尼特羊体重与体尺的相关性分析

[目的]分析内蒙古自治区锡林郭勒盟地方特色肉羊品种苏尼特羊体重与体尺指标的关联程度。[方法]随机选取5~6月龄发育及健康状况良好的苏尼特羊公羊247只、母羊260只，对羊只的体重（Y）、尾长（X₁）、尾宽（X₂）、体高（X₃）、体长（X₄）、胸围（X₅）进行生产性能测定，数据整理后使用SPSS 26.0统计学软件对体重与体尺指标进行相关性分析和多元线性回归分析，最终建立最优回归模型。[结果]影响苏尼特羊公羊和母羊体重的主要体尺指标为尾宽、体高、体长和胸围，且与体重均呈极显著（P<0.01）相关；逐步回归分析建立了多元线性回归模型，公羊的最优线性方程为：Y=0.57X₅+0.325X₄+0.241X₂-35.795，R²=0.834；母羊的最优线性方程为：Y=0.577X₅+0.246X₄+0.205X₂-31.94，R²=0.799。[结论]回归方程中胸围、体长、尾宽与体重相关性均较高，皆可作为苏尼特羊的体重预测模型。

Correlation Analysis between Body Weight and Body Size of Sunit Sheep

[Objective] This study was conducted to analyze the correlation between body weight and body size indexes of Sunit sheep, a local distinctive mutton sheep breed in Xilin Gol League of Inner Mongolia, China. [Method] A total of 247 Sunit rams and a total of 260 Sunit ewes aged 5 to 6 months with good development and health condition were randomly selected, and the indexes potentially associated with production performance including body weight （Y）, tail length （X₁）, tail width （X₂）, body height （X₃）, body length （X₄） and chest circumference （X₅） were measured. Following data processing, SPSS 26.0 software was used to perform correlation analysis and multiple linear regression analysis on the body weight and body size indexes. The best regression model was then established. [Result] The main body size indexes affecting the body weights of Sunit rams and ewes were tail width, body height, body length and chest circumference, which were all extremely significantly （P<0.01） correlated with the body weight. A multiple linear regression model was established by stepwise regression analysis. The optimal linear equation of Sunit ram was: Y=0.57X₅+0.325X₄+0.241X₂-35.795, R²=0.834; the optimal linear equation of Sunit ewe was: Y=0.577X₅+0.246X₄+0.205X₂-31.94, R²=0.799. [Conclusion] The body size indexes of chest circumference, body length and tail width had high correlation with body weight in the regression equation, and all of them could be used as the prediction indicators for body weight.