摘要
应用专门化品系的选择理论与方法，对杜洛克猪（ＳⅠ系）进行了连续１０年８个世代的遗传选育．选育结果表明杜洛克猪出生至９０ｋｇ体重的日龄缩短８ｄ，平均日增重增加６２ｇ，每千克体增重耗料减少０．２４ｋｇ，平均背膘厚减少０．４４ｃｍ，胴体瘦肉率提高３．６２个百分点；改善幅度分别为５．００％，８．８６％，８．４５％，２７．５０％和５．９８％．选育后的ＳⅠ系猪表现出优良的杂交配合力，杂交商品猪的主要经济性能得到明显提高．
Selection and breeding were conducted for 10 years and 8 generations in Duroc pigs (SⅠline) using the modern porcine genetics and breeding theory and method The results showed the age of reaching 90 kg body weight decreased by 8 d; average daily gain from 25 to 90 kg increased by 62 g; feed conversion ratio dropped by 0 24 kg; backfat thickness declined by 0 44 cm; and lean meat content in carcass increased by 3 62 percent points Improvements for these traits were 5 00%, 8 86%, 8 45%, 27 50% and 5 98%, respectively The pigs of SⅠline after selection resulted in a fine crossing combination ability and their hybrids produced high performance
关键词
杜洛克猪
专门化品系
选育改良
杂交利用
Duroc pigs
sire line
selection and improvement
crossing performance
