Study on Rule of Growth and Body Composition Deposition of Hunan Yellow Chicken
This experiment fully utilizes the load information of each curve model to conduct in-depth study on the growth and development process of poultry,and analyzes the derivation of the three growth model curves to obtain the three inflection points of the curves,which can provide references for the division of growth stages and the precise nutritional regulation of Hunan yellow chickens.A total of 300 one-day-old healthy Hunan yellow chickens with similar body weight were selected and divided into 6 goups with 50 chickens per group.The experiment lasted for 20 weeks.Twelve chickens were selected weekly for body weight measurement,and 6 chickens were anesthetized to death and crushed for body composition-dry matter(DM),crude protein(CP),ether extract(EE),crude ash(Ash)and gross energy(GE).Three growth models,Logistic,Gompertz and Bertalanffy were used to fit the body weight and body composition deposition of Hunan yellow chickens,and to calculate inflection point weeks of age(IPA),inflection point weight(IPW)and inflection point body composition(IPBC).Results showed that the optimal fitting model for the body weight growth curve of Hunan yellow chickens was Gompertz(R2＞0.99),with IPA for male+female at 2.16,8.28 and 14.40 weeks of age;for males at 2.51,8.01 and 13.50 weeks of age;and for females at 1.68,8.72 and 15.77 weeks of age.The IPW for male+female was 116.80,588.59 and 1 091.17 g;for males was 123.72,623.47 and 1 155.83 g;and for females was 111.89,563.88 and 1 045.35 g.The best fitting model for the body composition deposition curve of Hunan yellow chicken was Logistic(0.96＜R2＜0.97),with IPA of 4.91 to 5.58 weeks of age,9.30 to 9.61 weeks of age and 13.65 to 13.74 weeks of age,respectively.According to the fitting results of body weight curve,it can be concluded that the growth stages of Hunan yellow chickens can be divided into four stages:0 to 2 weeks of age,3 to 8 weeks of age,9 to 14 weeks of age and 15 weeks of age to market.And according to the fitting results of body composition deposition curve,it can be concluded that the growth stages of Hunan yellow chickens can be divided into four stages:0 to 5 weeks of age,6 to 9 weeks of age,10 to 13 weeks of age and 14 weeks of age to market.But according to the fitting degree re-sults,the stage division of body weight fitting results is more credible.[Chinese Journal of Animal Nutrition,2024,36(11):7003-7014]
万方数据
维普
