Research of Growth and Development Rules of Body Weight of Huangshan Black Chicken

The aim of this study was to reveal the growth and development rules of Huangshan black chicken's body weight,and the growth curves of Huangshan black chicken from 0 to 20 weeks were analyzed and fitted with three kinds of nonlinear models( Gompertz,Logistic and von Bertalanffy). The results showed that the growth curves of body weight could be fitted by three nonlinear curve models,and the fitness exceeded 0. 99,Gompertz model was much better to fit growth curves of the male's body weight( R2= 0. 9991),von Bertalanffy model was much better to fit the female's body weight( R2= 0. 9982). The estimated values of maximum body weight of adult cocks and hens were1885. 83 g and 1503. 54 g,respectively. The inflexion point of age of cocks( 9. 071 week) was late than that of hens( 7. 528 week). During the period of 2 to 20 week,absolute growth velocity curves and body weight of the male were higher than that of the female,respectively.