信宜怀乡鸡不同品系生长曲线拟合分析

信宜怀乡鸡作为列入国家畜禽遗传资源保护名录的著名品种，为了解其肉种鸡的早期生长发育规律，为其遗传资源保护和品系选育提供参考依据。使用Logistic、Gompertz和Bertallanffy3种非线性生长模型对怀乡鸡A、B两个品系母鸡0~9周龄早期体重生长数据进行曲线拟合和分析。3种模型均能很好地模拟怀乡鸡生长曲线。Bertalanffy模型的拟合A品系母鸡生长效果最佳（R^2=0．996），其拐点为（10．165，1047．7）；Gompertz模型的拟合B品系母鸡生长效果最佳（R^2=0．997），其拐点为（8．008，748．3）。3种模型对信宜怀乡鸡生长曲线的拟合和分析是可行的．可及时掌握怀乡鸡的生长发育规律。

Analysis and fitting of growth curve in different strains of Xinyi HuaiXiang Chicken

Xinyi HuaiXiang Chicken is a famous chicken breed that listed in the National Animal Genetic Resources Protection List,the study of early growth rules of Xinyi HuaiXiang chicken provide a evidence for its genetic resources conservation and trains breeding.The growth curve of A,B strains of HuaiXiang hen from 0 to 9 weeks old was analyzed and fitted with three kinds of nonlinear models （Gompertz, Logistic, von Bertalanffy）.The growth curves were appropriately fitted with three models. The Bertalanffy model had the best effect on fitting with the growth curves of A strain hen （R^2=0.996）, its growth inflexion was 10.165 weeks and 1047.7g.;The Gompertz model had the best effect on fitting with the growth curves of B strain hen（R^2=0.997）, its growth inflexion was 8.008 weeks and 748.3g.It is feasible to analyze and fit the growth curve of the HuaiXiang chicken using the three models.