›› 2016, Vol. 43 ›› Issue (3): 662-667.doi: 10.16431/j.cnki.1671-7236.2016.03.015

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Correlation Analysis between Body Weight and Body Size Indexes of 11-14 Months Old Dairy Buffalo

CHEN Yue-li1,2, Ren Feng-yun1,2, LIANG Xin2, WEI Sheng-ju2, CHEN Ming-tang2, HOU Yu1,2, LI Li-li2, TANG Qing-feng2, XIA Zhong-sheng1, ZOU Cai-xia1,2   

  1. 1. College of Animal Science and Technology, Guangxi University, Nanning 530005, China;
    2. Buffalo Research Institute, Chinese Academy of Agricultural Sciences, Nanning 530001, China
  • Received:2015-08-10 Online:2016-03-20 Published:2016-03-30

Abstract: The paper was to study the correlation between body weight and body size indexes of 11 to 14 months old growing dairy buffalo,which could provide a scientific reference to estimate the weight of dairy buffalo.Seventy six dairy buffalo with the age of 11 to 14 months were selected from the buffalo breeding farm in Guangxi buffalo research institute,body weight and body size indexes were measured according to normal means.Multivariate regression and polynomial regression were analyzed by the function of LINEST in Excel and correlation analysis and principal component analysis were used to analyzed the body weight and body size indexes by SPSS 17.0.The results showed that all the indexes of the body size traits factors affected the buffalo's body weight in different degree.There were extremely significant positive correlation between body weight and body height,body slanting length,high cross height,heart girth,abdominal circumference,chest width,chest depth,rump length,rump width and cannon circumference (P<0.01),in which heart girth was the most relevant (P=0.823),followed by the abdominal circumference,body slanting length,chest depth,cannon circumference and so on.The complex correlation coefficient of multiple regression equations between the body weight and the body size indexes were obtained by polynomial regression,and there was a strong linear relationship between body weight and body size indexes of 11 to 14 months old dairy buffalo,and body size indexes could be used to estimate the body weight of dairy buffalo.From the first principal component with the characteristic roots and the cumulative contribution ratio,we could know body weight,heart girth,body slanting length,abdominal circumference and cannon circumference had a big feature vector,and also had a big contribution to the first principal component,which basically reflected dairy buffalo's body structure of 11 to 14 months old,and this could be called body factor,the second principal component was called rump width factor and the third principal component was called body height factor.

Key words: body weight; body size indexes; dairy buffalo; polynomial regression; principal component analysis

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