新扬州鸡不同环境体重体尺生长曲线拟合研究

Study on the growth curve fitness of bodyweight and some body measurements of new Yangzhou chickens in different environments

两群在不同饲养条件下生长的新扬州鸡共209只,用3种不同的生长曲线进行拟合。结果表明:Lo-gistic,Gompertz,Bertalanffy 3种生长曲线模型拟合新扬州鸡体重生长过程,拟合度高,R2均超过了0.9975,但综合分析表明Gompertz曲线拟合最为合适,Bertalanffy曲线拟合效果最不理想,特别是成熟体重与实际情况不符。综合评价模型拟合参数表明,新扬州鸡早期生长介于肉用仔鸡和地方品种,在兼用型培育品种中也较为优秀。新扬州鸡体重生长过程和体尺生长过程比较表明,体重生长旺盛期比体尺生长要迟。

The growth courses of 209 new Yangzhou chickens from two group ones raised in different environments were fitted by three kinds of logistic, Gompertz and Bertalanffy growth curves. The results showed that all the three medals could describe the growth courses of new Yangzhou chickens. The indexes of fitness （ R2 ） of the three models for body weight were very high （0.9975）. Gompertz mode was the best model. Bertalanffy model was not suitable to describe the growth course because of over-estimation of maturity bodyweight. Evaluation of model fitness parameters shows that early growth of new Yangzhou chicken is prior to that of some egg and meat breeds and some native chickens in China, and slower than that of meat type breeds. The bodvweizht growth rate is slower than that of the tibia and sternum.