生长肥育猪胴体品质和瘦肉生长指数的研究

为验证NRC( 1998)生长猪营养需要模型 ,进而建立我国生长猪营养需要模型 ,本试验在较高营养水平下研究测定了生长肥育猪生产性能、胴体品质和瘦肉生长指数。全期试验结果表明 ,在一定营养水平和环境条件下 ,公、母猪日增重、采食量、饲料转化率差异不显著 (P >0 .0 5) ,但公猪日增重有高于母猪日增重的趋势。胴体品质上 ,公、母猪热胴体重、瘦肉重、背脂、瘦肉脂肪含量差异不显著 (P >0 .0 5)。通过测定热胴体重、最后肋背脂得到瘦肉生长指数为 :去势公猪 2 78g/d ,母猪 2 82g/d ,公母平均 2 81g/d。通过测定热胴体重 ,第 10肋背脂、第 10肋眼肌面积得到的瘦肉生长指数为 :去势公猪 2 56g/d ;母猪 2 72g/d ;公母平均 2 64g/d。将瘦肉生长指数、温度、饲养密度等参数输入NRC( 1998)模型得到的营养需要量估测值有一定实际意义 ,但在实践中的应用情况有待进一步评估验证

Research in Carcass Quality and Lean Growth Index of Growing-finishing Pigs

The performance, carcass quality and lean growth index of growing finishing pigs were determined, in order to test nutrient requirement model of NRC(1998) and establish nutrient requirement model for Chinese pigs. The result of the experiment indicated that ADG,ADFI, FCR was not significant between male pigs and female pigs (P>0.05). And hot carcass weight, lean weight, back fat, content of fat in the lean was not significant also (P>0.05). Lean growth index of barrows and gilts determined from hot carcass weight, back fat at the last rib and loin muscle area at the last rib was 278g/d, 287g/d, respectively. The average is 281g/d. Lean growth index of barrows and gilts determined from hot carcass weight, back fat at the 10thrib and loin muscle area at the 10thrib was 256g/d,272g/d, respectively. The average is 264g/d. Lean growth index, ambient temperature, feed stocking density and body weight was entered into the computer model. We found that the evaluation data of nutrient requirement was comparable to Chinese Feeding Standard. However, it still should be tested under practical condition.