高原型藏羊早期生长曲线拟合分析

通过生长曲线非线性拟合模型可以预测家畜的生长发育速率以及生长曲线的变化情况。本研究运用Logistic、Gompertz和Von Bertalanffy模型分析拟合了高原型藏羊的早期生长发育曲线。结果表明:3种模型均能较好地拟合高原型藏羔羊的生长曲线(R²>0.99),其中,以Von Bertalanffy模型拟合效果最佳。在Von Bertalanffy模型中,公羔拐点月龄、拐点体重和最大日增重分别为1.35、12 kg和246.67 g·d^?1,母羔拐点月龄、拐点体重和最大日增重分别为1.36、11.96 kg和239.33 g·d^?1。根据此模型建立的高原型藏羊早期发育阶段的生长曲线,可为早期选育提供理论依据。

Growth curve fitting for plateau-type Tibetan sheep

Nonlinear fitting models for growth curves can be used to predict the growth and development rate and changes in the growth curves of livestock.In this study,we fitted early growth and development curves for plateau-type Tibetan sheep using three types of nonlinear fitting model,namely the Gompertz,Logistic,and Von Bertalanffy models.The results showed that the growth of plateau-type Tibetan lambs could be well fitted using the three growth curve models(R²>0.99).Among the three models,the fitting effect of the Von Bertalanffy model was found to be better than that of the other two models.The age in months and weight at the inflection point,as well as the best gain of ram lambs were 1.35,12 kg,and 246.67 g·d^?1,respectively,whereas those for ewe lambs were 1.36,11.96 kg,and 239.33 g·d^?1,respectively.The growth curves for the early growth and development stage of plateau-type Tibetan sheep established using the Von Bertalanffy model can provide a theoretical basis for early selection and breeding.