北京油鸡生长曲线拟合与分析

Fitting and Analysis of Growth Curve in Beijing You Chicken

为了解北京油鸡的生长发育规律,本研究采用Logistic、Gompertz、yon Bertalanffy 3种非线性模型分别对北京油鸡0～20周龄的生长情况进行拟合与分析.结果发现,6周龄前北京油鸡公、母鸡的生长曲线基本一致,8周龄后公鸡生长速度明显快于母鸡,母鸡的发育高峰（8～10周龄）要早于公鸡（10～12周龄）约2周.3种模型均能较好地拟合北京油鸡生长曲线,拟合度（R2）均高于0.992,Gompertz模型的拟合度最高（公R2=0.995,母R2=0.996）.对Gompertz模型结果进行分析,公鸡的极限体重（公：2681 g,母：1738 g）、拐点时间（公：10.791周,母：7.758周）和拐点体重（公：986.285 g,母：639.375 g）均大于母鸡.本研究运用3种模型对北京油鸡进行生长曲线的拟合与分析是可行的,其中Gompertz模型拟合效果最佳,这一结果为北京油鸡生产提供了参考依据.

In order to understand the growth development law of Beijing You chicken,the body weight from 0 to 20weeks of birds were fitted with three nonlinear models,including Logistic,Gompertz and von Bertalanffy. The resultsshowed that the growth curves of cock and hen were the same before 6 weeks of age,but after 8 weeks of age,growthrate of cock was faster than that of hen,and growth peak of hen(8 to 10 weeks of age)was about 2 weeks earlierthan cock(10 to 12 weeks of age). Secondly,all models used were appropriate for growth curves of Beijing Youchicken,because fitness degree(R2)of growth data of chicken were all above 0.992. Using the Gompertz model,whichhad the highest R2for cock(R2=0.995)and hen(R2=0.996)respectively,was much closer to the actual observed values.They were higher for cock than hen,such as the maximum applicable adult body weight(cock∶2 681 g,hen∶1 748 g),thecritical age of the chicken(cock∶10.791 weeks,hen∶7.758 weeks),and critical body weight(cock∶986.285 g,hen∶639.375 g)separately. So it was concluded that the fitness and analysis were feasible for growth curve in Beijing You chickenusing three kinds of models,and Gompertz model was the best. It offered reference for the research of regularity ofgrowth and development in Beijing You chicken.