Investigation of body shape and appearance and correlation analysis between body size and body weight in Dianzhong cattle
ZHAO Shusheng
HE Shichun
WU Dongwang
LIU Yiduan
WANG Lixing
YU Kaixing
LI Qing
MAO Huaming
Abstract：In this study,77 Dianzhong cattle(47 bulls and 30 cows)were selected to investigate their body shape and appearance,and 50 of them(20 bulls and 30 cows)were measured by body size and body weight.The results showed that bulls'body weight were positively extremely correlated with body height,waist height,chest circumference,abdominal circumference,circumference of cannon bone,and rump length(P＜0.01),and positively significantly correlated with body slanting length and chest depth(P＜0.05),with the maximum correlation coefficient was found for the waist height(0.840).The body weight of cows was positively extremely correlated(P＜0.01)with all 11 indices and the maximum correlation coefficient was for abdominal circumference(0.907).In terms of principal components,the first principal component reflected the overall structural development of Dianzhong cattle.The second principal component reflected the development of the carcass of Dianzhong bulls,and the second principal component of cows,reflecting the development of the hindquarters of the cows.The third principal component and the fourth principal component of bulls,reflecting the development of the hindquarters of the bulls,and the third and fourth principal components of cows reflected the development and meticulous uniformity of the carcasses.According to the constructed regression equations,the optimal regression equation for the body weight of bulls in Dianzhong cattle was:body weight=-1 137.568+7.246 × waist height+2.612 × chest circumference+13.560 × circumference of cannon bone(R2=0.893).And that of cows was:body weight=-522.86+1.734 × abdominal circumference+1.905 × chest circumference+13.602 × circumference of cannon bone(R2=0.898).The results showed that the experimental results reflected the body size characteristics of cattle in central Yunnan,and the regression equation established in the experiment could be used as the body size index to evaluate the body weight,which provided data reference for cattle breeding and livestock resource protection in central Yunnan.
Keywords：Dianzhong cattlebody shape and appearancecorrelation analysisprincipal component analysisstepwise regression analysis
Publication Date：2025-03-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 65-70 )