土杂受体胚胎移植荷斯坦奶牛0～12月龄体重和体尺指标研究

Correlation Analysis between Body Weight and Body Size Indices of Embryo Transfer Holstein Cows with Local Cows as Receptor

[目的]探索土杂胚胎移植荷斯坦奶牛体重和体尺指标的生长发育规律。[方法]对初生、6月龄、12月龄土杂受体牛胚胎移植荷斯坦奶牛的体重和体尺指标进行相关性分析和回归分析。[结果]0～12月龄胚胎移植荷斯坦奶牛体重和体尺指标随日龄的增加而增加,符合牛的一般生长规律。依体高(X1)、体斜长(X2)、胸围(X3)和管围(X4)为自变量,以体重(Y)为因变量,采用"进入法"建立四元线性回归模型。初生、6月龄和12月龄胚胎移植荷斯坦奶牛体重与体尺指标的四元回归模型相关系数(R)分别为0.975、0.983和0.922,决定系数(R2)分别为0.950、0.966和0.849。0～12月龄胚胎移植荷斯坦奶牛的体重与体尺指标呈显著正相关,线性关系良好。[结论]0～12月龄土杂受体胚胎移植荷斯坦奶牛生长良好,适应酒泉地区的生态气候条件。

[ Objective ] The research aimed to discuss the growth and development laws of body size and body weight of embryo transfer Hol- stein cows with local cows as receptor. [ Method] The body weight and body size indices of new- born,6 -month- old and 12 -month- old embryo transfer Holstein cows with local cows as receptor were analyzed by correlation analysis and regression analysis. [ Resuh ] The body weight and body size indices of 0 - 12 month - old embryo transfer Holstein cows with local cows as receptor increased with the age, which were accordant with the general growth laws of cows. With body height （Xt ）, body slanting length （X2 ）, chest circumference （X3 ） and cannon circ- umference as independent variables, with body weight（Y） as dependent variable, quaternary linear regression models were established by ente- ring method. The correlation coefficients（R） of the quaternary regression models between the body weight and body size indices of new - born, 6 - month - old and 12 - month - old embryo transfer Holstein cows were 0. 975, 0. 983 and O. 922 respectively, the determination coefficients （ R2 ） were 0. 950, 0. 966 and 0.849 respectively. The body weight and body size indices of 0 - 12 month - old embryo transfer Holstein cows showed significant correlations, with better linear relationship. [ Conclusion] 0 --＇12 month - old embryo transfer Holstein cows with local cows as receptor grew well, which was suitable for the ecological climate conditions in Jiuquan area.