信宜怀乡鸡C品系第3世代产蛋率和累计产蛋数曲线拟合分析

Curve fitting analysis for laying rate and total egg number of the third generation of Xinyi Huaixiang chicken C strain

【目的】探讨信宜怀乡鸡C品系(颈部有圈浅黄色羽毛)第3世代产蛋率和产蛋量的变化规律,为提高怀乡鸡产蛋性能提供科学参考。【方法】统计信宜怀乡鸡C品系第3世代19~52周龄的产蛋率和累计产蛋数,采用伍德、杨宁、分室和三次方程4种模型对产蛋率进行拟合分析,采用Logistic、Gompertz和Von Bertalanffy模型对累计产蛋数进行拟合分析,计算各模型的参数值和拟合度(R2)。【结果】杨宁模型R2最高(0.988),其次是分室模型(0.976),伍德模型和三次方程R2稍低,分别为0.833和0.733;Logistic、Gompertz和Von Bertalanffy 3种累计产蛋数模型R2分别为0.988、0.995和0.998;杨宁模型的最高产蛋率为73.85%,与实际观测值(73.66%)最接近;Von Bertalanffy模型的极限产蛋数为128.96,相对于Logistic和Gompertz模型(分别为125.56和127.88),与实际观测值(131.62)最接近。【结论】杨宁模型和Von Bertalanffy模型分别对信宜怀乡鸡C品系第3世代产蛋率和累计产蛋数拟合效果最佳,可用于信宜怀乡鸡产蛋规律的估计和预测。

【Objective】The present study investigated the change rule of laying rate and egg production of the third generation of Xinyi Huaixiang chicken C strain（light yellow feather circled around the neck）,in order to provide scientific reference for improving laying performance of Huaixiang chicken. 【Method】Laying rate and total egg number of the third generation of Xinyi Huaixiang chicken C strain at 19-52 week age were collected. Four models, namely Wood,Yang-Ning, Mc Millan and cubic equation, were adopted to fitting analysis on laying rate; and Logistic,Von Bertalanffy and Compertz were employed in fitting analysis on total egg number. The parameters and fitting degree（R2） of these models were calculated. 【Result】R2of Yang-Ning was the highest（0.988）, followed by Mc Millan（0.976）,Wood（0.833） and cubic equation（0.733）. R2 of Logistic,Compertz and Von Bertalanffy for total egg number was 0.988,0.995 and 0.998 respectively. In Yang-Ning, the highest laying rate was 73.85%, which was the closest to the observed value（73.66%）. In Von Bertalanffy, the maximum egg production was 128.96, which was the closest to the observed value（131.62） compared to the values of Logistic（125.56） and Gompertz（127.88）. 【Conclusion】Yang-Ning and Von Bertalanffy have the optimum fitting effects on laying rate and total egg number of the third generation of Xinyi Huaixiang chicken C strain,which can be used for prediction of laying rate and egg production of Xinyi Huaixiang chickens.