建立种猪核心群提高商品猪质量的研究

在广西１０个工厂化猪场进行了提高商品猪质量的研究。通过建立种猪核心群，种猪综合指数选择，严格选种选配，使种猪生产性能和肉猪肥育性能，以及体型外貌的整齐度都有较大的改善。１９９３年与１９９１年比较，长白猪核心群产仔数提高５．８％，２８日龄断乳重提高７．６％，商品杂交猪日增重提高１２．６％，料重比降低５．９％。经ｔ测定，多数经济性状Ｐ＜０．０１，差异高度显著。１０个猪场每年产仔数增加４９６８头，可节约种猪料２０万ｋｇ；每头商品猪可增加活重７．４ｋｇ，每年可增加活重７２．７４万ｋｇ，取得了显著的经济效益和社会效益。

A STUDY ON QUALITY IMPROVEMENT OF COMMERCIAL PIGS THROUGH NUCLEUS HERDS

factory pig farms to be established nucleus herds of breeding pigs for mating and selecting according to the comprehensive index of pigs from 1991 to 1993. The performance traits of breeding pigs, the fattening ability and the uniformity of body type were significantly improved. For example, the number born and body weight of 28-day old piglet in the nucleus herd of Landrace increased by 5.8% and 7.6% respectively.And the body weightof commercial fattening pigs increased by 12. 6%,and the ratio of feed to body weight decreased 5. 9%.The differences of most economic characters were significant by t-test (P<0. 01 ).Moreover,the economic efficiency was very good with an increase of number born of 4 968 per year,and a saving of 200 000 kg feed. Each commercial pig increased 7.4 kg of living weight with a total increase of 727 400 kg per year. The results showed that there weresignificant both economic and social benefits.