贵州地方鸡种体重生长曲线的拟合分析OACSTPCD

In order to identify the law of growth and development of five breeds of native chickens in the Guizhou arrea,the growth curves of Chishui black bone chicken,Qiandongnan Xiaoxiang chicken,Wumeng black bone chicken,Weining chicken and Guizhou yellow chicken were fitted by Logistic,Gompertz and von Bertalanffy nonlinear models.The body weights of 300 native chickens in Guizhou(60 chickens of 5 breeds each,including 30 cocks and 30 hens)at 0,2,4,6,8,10,12,14,16 and 18 weeks of age were measured in this experiment,with the aim of exploring the growth and development rules of the 5 breeds.The results showed that the growth trend of the five breeds of chickens was same,that the three models could fit the growth changes of the five breeds well,at a fitting degree above 0.98.The von Berta-lanffy model had the best fitting effect on the growth curve of the five breeds.During the same period of growth,the average weight of Guizhou yellow chicken was the highest,that of Qiandongnan Xiaoxiang chicken was the lowest,and the average weight of Chishui black bone chick-en,Wumeng black bone chicken and Weining chicken was similar.The inflection point age of the five breeds were at week 9.2,week 7.9,week 7.3,week 8.9,and week 8.4,respectively;and their inflection point weight was 870.71 g,509.18 g,708.29 g,834.35 g,and 945.52 g,respectively.These results might be used to explain the growth and development characteristics of different breeds of chickens,and serve as theoretical guidance for scientific feeding of chickens in the Guizhou area.