瘦肉型种猪早期生长性状校正公式的制定及评估

Design and Evaluation of Adjusted Equations for Early Growth Performance of Commercial Breeding Swines

以杜洛克猪、长白猪和大约克猪3个典型瘦肉型猪种为研究对象,分别以Saturation为日龄与体质量关系拟合,线性模型为体质量与背膘关系拟合的最适模型,分别制定出符合国情的瘦肉型猪早期目标性状(50 kg体质量日龄和背膘厚)的校正公式。对早期性状校正值与全期性状校正值的简单相关分析(CORR)和典型相关分析(CANCORR),相关系数均达到极显著,证明早期性状校正公式是适合的。早期性状与终测性状间具有显著相关性。选用典型综合指数模型分别进行早期和全期生长性状的综合评定,经Spearman秩相关分析达到极显著,说明在一定选择强度下,早期性状的表观选择与全期选择具有很高的一致性,早期选择是可行的。

Based on the earlier reports that the saturation model was the most optimal model for prediction of relationship between age and body weight,and the linear model is the most optimal model for prediction of relationship between body weight and backfat thickness of three commercial pig breeds.However,in this study,we adjusted the equations for days and backfat thickness at 50 kg body weight.The robustness for the adjusted equations were evaluated by the simple correlation analysis（CORR） and canonical correlation analysis（CANCORR）,between the early and whole period revision value,and the results all reached the extreme difference.It proved that the adjusted equations were suitable,and statistically evident between the early and the entire period traits.Additional,we chose the typical comprehensive index model to carry on comprehensive assess for early and entire period performance,and the Spearman＇s rank correlation reached the extreme difference for total selection index between two periods.It showed that the early selection was viable,had very high consistency with the entire period selection under definitely choosing strength.These revised expressions of the expected traits had potential application for breeding selection in farm.