The Correlation and Regression Analysis of Weight and Size Traits in Jiangyue Donkey

Jiangyue donkey is an escellent local milk and meat breed in Xinjiang.To accelerate the speed of breeding,reproduction and conversation,correlation and multiple regression analysis between body weight and body size of 101 Jiangyue donkey was made by R Project(2.15.0).The results showed that age had a great significant effect on height at wither,heart girth and body weight(P0.001),and had a significant effect on body length and circumference of cannon bone,which the value of height at wither,body length,height at wither,circumference of cannon bone and body weight within 1~3 ages group were the highest compared other ages groups.And the height at wither,circumference of cannon bone and body weight of male more significantly better than female within 1~3 ages group.There were highly difference between body weight and body size(P0.001).The best regression model showed that the most important of effect on body weight was heart girth,height at wither and body length in sequence.To gain the better effect,heart girth,height at wither and body length should be more chosen and the optimal regression model should be referenced in the breeding,reproduction and conservation of Jiangyue donkey.