杜洛克猪饲料利用效率测定阶段及RFI校正公式研究

Study on the Determination Stages and RFI Correction Formula of Feeding Efficiency in Duroc Pigs

为了解决中国猪育种过程中饲料利用效率测定期长、无校正公式等问题,本研究对应用4种不同方法计算的杜洛克猪全期和不同生长阶段的剩余采食量(RFI)进行了Pearson相关性分析,以得到可代表全期RFI的测定阶段,进而缩短测定时间。应用不同体重RFI线性插值与达100 kg真实体重RFI对杜洛克猪达100 kg体重RFI校正公式参数进行拟合求解,以得到杜洛克猪达100 kg体重RFI校正系数。结果显示,4种方法计算的RFI均为105~180 d生长阶段和全期相关性最高,相关系数均在0.92以上,适配回归方程为:全期RFI=0.9786×(105~108 d测定阶段RFI)+0.0002,最高拟合度为0.9734。杜洛克公猪及母猪达100 kg体重RFI校正系数分别为0.0519和0.0179。在此系数下,公猪70~100 kg范围内校正准确性较高,母猪40~100 kg范围内校正均比较准确。本试验结果可直接用于制定育种方案,既可缩短RFI测定的时间,又可为更准确地计算RFI提供参考,为制定优良的育种方案提供有效数据。

In China pig breeding,feeding efficiency testing usually cost too much time,and the calibration formula was lack all the time.In this study,the feeding efficiency testing period of Duroc pigs and the calibration formula of residual feed intake(RFI)were analyzed to solve the problems above.The Pearson correlation programs were used to analyze RFI and NLIN programs were used to acquire the correction coefficient of RFI in Duroc pigs.The linear interpolation of different body weight RFI and the real weight RFI of 100 kg were used to fit the parameters of Duroc pigs up to 100 kg body weight RFI correction formula,and obtain RFI correction coefficient of Duroc pigs up to 100 kg body weight.The results showed that the correlation of RFI calculated by four methods at 105-180 d and whole testing period were the highest,and the correlation coefficient was above 0.92.The adaptive regression equation:Full-time RFI=0.9786×(105-108 d measurement phase RFI)+0.0002,the highest fit was 0.9734.The RFI correction factor for Duroc boars and sows up to 100 kg body weight were 0.0519 and 0.0179,respectively.Moreover,under this coefficient,the accuracy of correction in the range of 70-100 kg for boars was higher,and the correction of sows in the range of 40-100 kg was more accurate.These results could be directly used to develop breeding programs,which could reduce the RFI measurement time,provide references for more accurate calculation of RFI to develop excellent breeding programs.