2个杂交鸡种生长性能比较与生长曲线模型建立

Comparison of growth performance and establishment of growth curve model of two hybrid chicken breeds

【目的】利用茶花鸡2号E系公鸡、腾冲雪鸡白肉公鸡分别与狄高D系母鸡杂交得到Y系和N系鸡,评定2种杂交后代生长性能,为探究最具优势的杂交后代生长发育规律提供理论参考。【方法】以同日出雏的Y系鸡和N系鸡作为研究对象,测定0~29周龄体重指标,记录生长发育情况;并在60、90和120日龄,随机挑选Y系和N系公鸡和母鸡各30只,测定体尺指标,比较2种鸡的差异及相关性,确定最具优势的杂交后代;利用Logistic、Gompertz和von Bertalanffy等3种非线性生长模型对其不同性别下的体重进行曲线拟合,求得最佳生长曲线模型。【结果】0~29周龄体重生长曲线中,Y系的公鸡体重明显优于N系,Y系的母鸡体重略优于N系。体重和体尺指标测定结果显示,Y系鸡和N系鸡均为公鸡极显著大于母鸡(P<0.01),且同一性别下Y系鸡明显优于N系鸡。用具杂交优势的Y系鸡作生长曲线拟合分析,von Bertalanffy模型拟合值更接近实测值,是Y系鸡最佳生长曲线模型。体重与体尺指标相关分析显示,Y系鸡的体重与胫围间具有较高相关性,因此,可将胫围作为Y系鸡选育的参考标准。【结论】Y系鸡即茶花鸡2号E系公鸡与狄高D系母鸡的杂交改良效果优于N系鸡即腾冲雪鸡白肉公鸡与狄高D系母鸡的杂交改良效果,且von Bertalanffy生长曲线拟合模型能更准确地模拟Y系鸡生长发育规律,确定为最佳生长曲线模型。

【Objective】The Y-strain chickens were obtained by crossing the E-strain cocks of Chahua No.2 with D-strain hens of Digao,and the N-strain chickens by crossing the Tengchong Snow Chickens with white flesh with D-strain hens of Digao.The growth performance of the two hybrid progenies was evaluated for the growth and development law of the most dominant hybrid progeny.【Method】The Y-strain chickens and N-strain chickens born on the same day were selected as the research objects.After that,the body weight indexes of 0-29 weeks were measured,and the growth and development situations were recorded.At 60,90 and 120 days of age,30 cocks and 30 hens were randomly selected from Y-strain and N-strain chickens for the measurement of body weight and body size to compare the differences and correlations of the two breeds to determine the most dominant hybrid progeny.Three nonlinear growth models,Logistic,Gompertz and von Bertalanffy,were used for the curve fitting of the body weight of different hybrid progenies under different sexes to obtain the best growth curve model.【Result】The weight growth curve of 0-29 weeks showed that the body weight of Y-straincocks was greatly better than that of N-strain cocks,and the body weight of Y-strain hens was slightly better than that of N-strain hens.The results of body weight and body size suggested that cocks were extremely significantly larger than hens(P<0.01)in Y-strain and N-strain chickens,and Y-strain chickens were obviously better than N-strain chickens under the same sex.Y-strain chickens with hybrid advantage were used for growth curve fitting analysis which demonstrated that the fitting value of von Bertalanffy was closer to the measured value.Thus,von Bertalanffy was the best growth curve model for the Y-strain chickens.Moreover,the analysis of body weight and body size showed that there was a high correlation between the body weight and shin girth of Y-strain chickens,and therefore shin girth could be used as a reference standard for Y-strain chickens breeding.【Conclusion】The hybrid improvement result of Y-strain chickens obtained from the cross of E-strain cocks of Chahua No.2 with D-strain hens of Digao is better than that of N-strain chickens obtained from the cross of cocks of Tengchong Snow Chickens with white flesh and D-strain hens of Digao.And the growth curve fitting model of von Bertalanffy can more accurately reflect the growth and development law of Y-strain chickens,making it the best growth curve model of Y-strain chickens.