二元杂母猪繁殖性能和三元杂商品猪育肥性比较试验

Experiment on reproductive and fattening performances of different crossbreeding combinations of pigs

用长白公猪与大约克母猪杂交,或大约克公猪与长白母猪杂交,生产长大和大长二元杂母猪,并用长大和大长二元杂母猪作为母本,再与杜洛克公猪进行杂交,生产杜长大和杜大长三元杂商品猪,比较评价杂交猪组合后代的表现。结果表明,长大杂母猪比大长杂母猪的窝产仔数多0.3头,21日龄断奶仔猪头均重高0.3kg;杜长大三元杂小猪比杜大长三元杂小猪的日增重高25g,料重比降低0.04;杜长大比杜大长商品猪的日增重高11g,瘦肉率高1.3个百分点。表明两组母猪及商品猪的性能差异不显著(P>0.05),在生产中都可以推广。

To evaluate the performances of the offspring of the major crossbreeding combinations of pigs in Guangxi, the bi-crossbreeding Landrace × Yorkshire pigs were generated by using the Landrace （Denmark × Seed Denmark） male swine crossed with Yorkshire sow, and the bi-crossbreeding Yorkshire × Landrace pigs were generated by using the Yorkshire boar crossed with Landrace sow. The tri-crossbreeding Duroc × Landrace X Yorkshire pigs or Duroc × Yorkshire ×Landrace pigs were generated by using Duroc boar crossed with Landrace × Yorkshire sow or Yorkshire × Landrace sow, respectively. The results showed that the Landrace × Yorkshire sow produced 0.3 piglet per birth more than the Yorkshire × Landrace sow did. The body weight of Landrace × Yorkshire sow＇s piglet was 0.3 kg more than that of Yorkshire × Landrace sow＇s piglet for 21 days after ablactation. The daily gain of a tri-crossbreeding Duroc × Landrace × Yorkshire piglet was 25 g more than that of a tri-crossbreeding Duroc X Yorkshire × Landrace piglet during the infant period. For utilization ratio of feed, the rate of feed to body weight of the former was 0. 04 less than that of the latter. For fattening performance, the daily weight gain of a Duroc ×Landrace × Yorkshire commercial pig was 11 g more than that of a Duroc × Yorkshire × Landrace commercial pig. The lean meat of the former increased 1.3% than that of the later. No significant differences（P〉0.05） were found in production performance between the tested groups, which suggested that both crossbreeding combinations could be used in commercial pig production.