安义瓦灰鸡生长曲线拟合及分析OA

[Objective]This study aims to fit the growth curve of Anyi gray chickens using nonlinear models to investigate their growth patterns and provide a theoretical basis for production.[Method]A total of 100 fertilized eggs were collected from the Anyi Gray Chicken breeding farm,and 91 chicks were hatched.The chickens were reared in mixed-sex multilayer cages from 0 to 6 weeks and in free-range groups under woodland from 7 to 18 weeks.Body weights were measured at 0,2,4,6,8,10,12,14,16,and 18 weeks of age.Three nonlinear models Logistic,Von Bertalanffy,and Gompertz were applied to fit the growth curves of male and female Anyi gray chickens.[Result]All three models achieved R² values above 0.99.The Von Bertalanffy model showed the best fit for males,while the Gompertz model was optimal for females,both with R² values of 0.998.The inflection point of the body weights for male and female chickens were 782.89 g and 469.39 g,respectively,and the inflection point of ages were 9.21 weeks and 7.51 weeks,respectively.The weight of cocks in this breed was significantly(P<0.05)higher than that of hens in each week.Males reached their peak growth rate at week 10,whereas females reached it at week 8.[Conclusion]The Von Bertalanffy model is identified as the most suitable for male Anyi gray chickens,with the equation:W=2 642.25×(1-0.807e-0.096t)3.The Gompertz model is optimal for females,with the equation:W=1 275.95e-3.747×exp(-0.176t).