兰州大尾羊体重和体尺性状的主成分分析和聚类分析OA

To investigate the correlation between body weight and body measurement traits of Lanzhou Fat-tailed sheep and to reveal their growth and development patterns as well as genetic characteristics,this study measured the body height(X1),body length(X2),chest circumference(X3),chest width(X4),chest depth(X5),cannon circumference(X6),rump width(X7),tail length(X8),tail width(X9),and body weight(Y)of 156 adult Lanzhou Fat-tailed sheep(18 rams and 138 ewes).The data were subjected to correlation analysis,principal component analysis,regression analysis,and hierarchical cluster analysis.The results showed that the body weight of Lanzhou Fat-tailed sheep ram was ex-tremely significantly positively correlated with body height,body length,chest circumference,chest width,cannon cir-cumference,and rump width,while the body weight of ewe was extremely significantly positively correlated with all nine body measurement traits.Principal component analysis simplified the body weight and body measurement traits of rams and ewes into three and two principal components,respectively,with chest circumference,body height,and tail length being the main body measurement traits contributing to these principal components.The optimal regression equations for ram and ewe were Yram=1.635X3+0.417X5-100.635(R2=0.886,P＜0.01)and Yewe=0.578X1+0.433X3+4.482X6+0.926X9-85.937(R2=0.631,P＜0.01),respectively.Additionally,cluster analysis divided Lanzhou Fat-tailed sheep into three different growth and development groups,in which each group showed similar body weight and body measurement traits.In conclusion,there are significant differences and correlations in the growth levels of body weight and body mea-surement traits in Lanzhou Fat-tailed sheep populations,among them,chest circumference,body height,and body length showed the strongest correlation with body weight.Therefore,ram selection and breeding should be focus on chest cir-cumference and body height,while ewe should be focus on chest circumference and body length.