前期营养水平对羔羊两阶段育肥效果的影响

试验旨在研究前期营养水平对羔羊两阶段育肥效果的影响。选用蒙古羔羊(羯羊)80只,随机分为对照组(CG)、中等受限组(RG1和RG2)和严重受限组(RG3)4个处理组。进行营养限制期60 d 和补偿期90 d 的羔羊生长育肥试验。限制期4个组日粮对应能量(ME)、氮(CP)水平分别为10.88、10.88、9.41、8.62 MJ/kg和15%、10%、10%、5.7%。补偿期各组饲喂同一能氮水平日粮(ME:9.75 MJ/kg;CP:12%)。研究羔羊在限制期和补偿期体重、日增重、屠宰率、净肉率、肉骨比、胴体产肉率、眼肌面积和GR值的变化规律。结果表明,限制期结束时,CG组羔羊的体重显著高于RG1和RG2组(P＜0.05),极显著高于RG3组(P＜0.01),CG组羔羊的屠宰率、净肉率、肉骨比、胴体产肉率、眼肌面积和GR值明显高于受限组。补偿期结束时,RG3组羔羊日增重显著高于CG组(P＜0.05),受限组羔羊体重、屠宰率、净肉率、肉骨比和胴体产肉率有逐渐接近CG组的趋势,且4个组羔羊的眼肌面积和GR值差异不显著(P＞0.05)。因此,蒙古羔羊在限制期受到日粮中不同能氮水平限制后,经过补偿期后体重表现出不同程度的补偿效应,而且日粮中蛋白质的限制比能量的限制对补偿生长的负影响更大。在限制期蛋白质的限制影响羔羊的产肉性能较明显,补偿期能量的补充更重要。

The Effects of Prophase Nutrition Level on the Performance of Lambs in a Two Phase Finishing Scheme

This experiment was conducted to investigate the effects of prophase nutrition level on the performance of lambs in a two phase finishing scheme.Eighty Mongolian lambs(castrated lambs) were randomly divided into four equal groups:control group(CG) = fed ad libitum(ME:10.88 MJ/kg,CP:15%);moderate restricted groups(RG1 and RG2) = fed restricted(ME:10.88 MJ/kg,CP:10% and ME:9.41 MJ/kg,CP:10% respectively);severe restricted group(RG3) = fed restricted(ME:8.62 MJ/kg,CP:5.7%).The lambs were fed restricted diets f...