Growth Model Of Body Weight And Size Of Yanshan Hongyu Broiler And Establishment Of Enterprise Standards

In order to explore the growth and development law of Yanshan Hongyu broilers under different feeding methods,the following experiments were designed in this study: 400 Yanshan Hongyu broilers produced in the same batch,200 males and 200 females,were divided into 4 groups on average,2 groups were free-range and 2groups were caged.Chickens were weighed when they entered the experimental field,and then 30 chicks in each group were randomly selected for data measurement.The weight was recorded every week in the first month,and then the weight and body measurements were measured once a month.They were slaughtered at the age of 5months to measure the slaughter performance.Fit the body size with the growth model,and draw the growth curve and fitting curve;Through multiple linear regression analysis,the optimal regression equations of Yanshan Hongyu broilers between 4-20 weeks of age and between 20 weeks of age and slaughter performance were established under different feeding modes.According to the measured data,the enterprise standard of Yanshan Hongyu broiler under the conditions of free-range and cage culture was drawn up.The results are as follows:1.The feeding mode has great influence on the weight of Yanshan Hongyu broilers,but little influence on the body size.2.Gompertz model has the best fitting effect on the law of body weight growth of captive Yanshan Hongyu chicken,with the fitting degree of 1 for cock and 0.999 for hen.3.Bertalanffy model is the best model to fit the growth and development law of Yanshan Hongyu chicken.4.0-8 weeks old is the fastest growth period of Yanshan Hongyu chicken.5.Different feeding modes and different genders have different body measurements,as follows: Free-range rooster: body oblique length,chest circumference and keel length;Free-range hens: chest width and dragon bone length;Caged roosters: oblique body length and chest width;Caged hens: chest width and bust.6.In the breeding of Yanshan Hongyu chicken,chest width,keel length and body inclination length can be used as indirect selection indexes.7.Body weight is the most important index affecting the slaughter performance of Yanshan Hongyu chicken,followed by body length.