经济动物学报

为评价国家地方鸡种基因库保种群体的保种效果情况，采用三种非线性生长模型Logistic，Gompertz以及Bertalanffy对2019年和2022年2个世代的琅琊鸡保种群母鸡生长情况进行拟合，结果表明：2个世代体重拟合度(R²)都>0.996，根据R²值Gompertz模型对琅琊鸡生长拟合效果最佳，2个世代拟合的成熟体重为1967.965～1896.725g，拐点周龄为6.1～6.3周。结果符合琅琊鸡的保种和实际生产情况。综上，在地方鸡种保种过程中，可根据生长曲线特征对保种群体科学合理的进行饲养管理和监测保种效果，为地方鸡种资源的保护开发利用提供科学依据。

In order to evaluate the preservation effect of the populations in National Chickens Genetic Resources (Jiangsu)， three nonlinear growth models， Logistic， Gompertz and Bertalanffy， were used to fit the growth of hens in Langya chicken preservation population of two generations in 2019 and 2022. The results showed that the body weight fitting degrees (R²) of three models in the two generations were all above 0.996. According to the R² values， the Gompertz model had the best growth fitting effect on Langya chickens. The mature body weights fitted for the two generations ranged from 1967.965g to 1896.725g. The turning point age ranged from 6.1 to 6.3 weeks. The results were consistent with the actual situations of the preservation and production in Langya chickens. In summary，in the process of local chicken preservation， the population can be scientifically and reasonably fed and managed. And the preservation effect can be monitored based on the characteristics of the growth curve. This study will provide a scientific basis for the protection， development and utilization of local chicken genetic resources.