美萨澳三元杂交肉羊体重与体尺的主成分分析和回归模型的建立OA

[Objective]To explore the relationship between body weight and body measurements in tri-crossbred mutton sheep derived from Chinese Merino,White Suffolk breeds and Australian White.[Methods]Body weight and body measurements(body length,withers height,chest circumference and cannon circumference)were measured in 100 two-year-old mutton sheep.Using SPSS 26.0 software,correlation analysis,principal component analysis and multiple regression analysis were performed to establish relationships between body weight and body measurements in adult crossbred mutton sheep,and to construct optimal regression models for body weight on body measurement traits.[Results]The results indicated that the coefficients of variation for body weight and body measurements in crossbred mutton sheep,ranked from highest to lowest,were:body weight>cannon circumference>body length>withers height>chest circumference.There were extremely significant positive correlations between body weight and withers height,body length,chest circumference,and cannon circumference(P<0.01).Body length,chest circumference and cannon circumference collectively explained 71%of the variation in body weight in rams,while chest circumference and body length alone accounted for 79%of this variation in ewes.[Conclusion]Scientific reference for the selective breeding of hybrid mutton sheep can be provided by these findings.