贵州黄鸡青胫品系与长顺绿壳蛋鸡杂交品种的生长性能分析OA

[Objectives]The growth performance of hybrids between the Guizhou yellow chicken blue-shank line(GZ)and the Changshun green-shell egg chicken(CS)was systematically studied to provide a scien-tific basis for the genetic improvement of Changshun green-shell egg chickens.[Methods]Guizhou yellow chicken blue-shank line(GZ)and the Changshun green-shell egg chicken(CS)were crossed to obtain 4 experi-mental groups including GZ(GZ♂×GZ♀),CS(CS♂×CS♀),GC(GZ♂×CS♀),and CG(CS♂×GZ♀)with a complete diallel design.60 chickens(half male and half female)from each experimental group were randomly selected for weighing.A total of 240 chickens were used as the experimental population to record the changes in weight at each stage of the experiment for 126 d.Three nonlinear growth models including Logistic,Gompertz,and Von Bertalanffy were used to fit and analyze data on the weight of hybrids from the reciprocal crosses to determine the patterns of growth and development in different hybrids from different crosses by comparing the growth per-formance of hybrids with that of its parents.[Results]The birth weight and 2-week-old body weight of hybrids from the reciprocal crosses were significantly higher than that of the parents(P<0.05),with a high rate of het-erosis(H of 9.2％-14.2％).There was a certain degree of heterosis at 0-10 weeks of age in the reciprocal crosses,with body weight significantly higher than that of the CS group(P<0.05).All three models fitted the growth curve of reciprocal offspring well,with a coefficient of determination(R²)exceeding 0.997.Among them,the Gompertz model had the highest goodness of fit,with a R² of 0.999 for the direct cross,an inflection point age of 9.07 weeks,and an inflection point weight of 804.25 g.The coefficient of determination(R²)for the reciprocal cross was 0.999,with an inflection point age of 9.27 weeks,and an inflection point weight of 835.98 g.[Conclu-sions]The Gompertz model is the optimal model for the growth of hybrids from reciprocal crosses between the Guizhou yellow chicken blue-shank line(GZ)and the Changshun green-shell egg chicken(CS).It will provide reference for the genetic improvement of Changshun green-shell egg chickens.