乐平猪的杂交及杂种优势效应研究

Study On Cross And Heterotic Effegt Of Leping Pig

乐平猪与外来瘦肉型猪杂交试验,设有二元组合3个、三元组合6个、亲本对照组5个,试猪206窝,1993头,猪宰测定189头。日粮营养水平母猪料每公斤含有消化能1.9～2.8兆卡,粗蛋白质11％～14％;肥猪料分别为2.7～2.8兆卡和15％～16％;仔猪料亦为3兆卡和18％。经六年研究,已筛选出三个较优组合:大乐二元杂交组合,平均产仔11.08头,育成8.85头、窝重123.35公斤、日增重563.9克、料肉比3.35:1,胴体瘦肉率50.68％,肌肉粗蛋白19.04％;长大乐三元杂交组合依次为12.61头、9.72头、145.17公斤、548.2克、3.29:1,56.18％和19.84％;杜长乐三元杂交组合亦为12.73头、9.85头、131.09公斤、570克,3.41:1、60.06％和19.94％。这几个组合,已在赣东北地区推广应用,取得较大的经济效益。

Cross experiment between leping and the foregn lean meat pigs was made, including 3 two - way cross combinations and 6 three -way cross combinations ,and 5 parents (as controls). 1993 heads, pigs came from 206 litters, among which 189 heads were slaughtered for getting expermental data, with 1. 9-2. 8Mca/kg of D. E and 11%-14% of C. P for the sow, 2. 8-3. 1Mca/kg of D. E and 15%-16% of C. P for fattening pigs and 3. 0 Mca/kg of D. E and 18% of C. P for the piglets. After 6 years studies, 3 better combinations have been selected, including: large Yorkshire X leping, a two-way cross combination which has the average farrow for 11. 08 heads, 8. 85 heads nursed, 563. 9g daily gain, the requirement of Mixed feed of 3. 35kg for per kg gain in wt, the lean meat rate of 50. 68%, and the cp of muscle of 19. 04% ;Landrace X large Yorkshire X leping, a three-way cross combination 12. 61l heads, 9. 72 heads, 548. 2g, 3. 39kg, 56. 18% and 19. 84% respectively; Duroc X landrace x leping, a three-way cross combination, 12. 73 heads 9. 85 heads, 570kg, 3. 41kg, 61. 05% and 19. 94% respectively. The three combinations have been popularly used in Northeastern Jiangxi and gained deal of economic