基于生产性能测定的青海多胎藏羊生长曲线模型优化OA

In order to explore the growth and development law of multi-birth Tibetan sheep at the age of 1～6 months and provide a basis for their scientific breeding and feeding management,the 1,3,4,5,6 month-old multi-birth Tibetan lambs in the Plateau Modern Ecological Animal Husbandry Demonstration Park in Haiyan County,Haibei Prefecture,Qinghai Province were selected to body weight,body height,body length and chest circumference,and the growth curve model was constructed by correlation analysis and polynomial regression.The results showed that the correlation coefficients between the indexes were ≥ 0.94 with the increase of monthly age.The first-order polynomial regression model(y=-0.47+0.23A+0.08H+0.11L+0.10C)with monthly age,body height,body length and chest circumference as independent variables was verified by 5-fold cross-verification R2=0.8793 and RMSE=0.98 kg,which had strong generalization ability and could accurately predict the weight of 1～6 months old lambs.The constructed growth model accounted for 87.93％of the body weight variation and could accurately simulate the early growth and development patterns of Qinghai multi-fetal Tibetan sheep.