日粮能量和蛋白水平对瘦肉型生长育肥猪生长性能的影响

选取60±1.5 kg、90.0±1.5 kg杜长大(D×L×Y)生长育肥猪48头(公母比例为1∶1),通过对平均采食量(ADFI)、平均日增重(ADG)和料重比(F/G)进行比较分析,考察蛋白和能量水平对其生长性能的影响。结果表明:日粮能量和蛋白水平对60～90 kg瘦肉型生长育肥猪ADG、ADFI和F/G均有显著影响(P<0.05);日粮能量和蛋白水平对90～120 kg生长育肥猪ADG的影响不显著(P>0.05),对ADFI、F/G影响显著(P<0.05)。60～90 kg、90～120kg阶段杜长大生长育肥猪适宜的能量和蛋白水平分别为13.90 MJ.kg-1、15.90%和14.62 MJ.kg-1、14.90%;多元回归分析得到90～120 kg瘦肉型生长育肥猪DEI、CPI与ADG的回归方程为:ΔW=-12.772DEI+23.467CPI+351.156(R2=0.881,P<0.05)。

Effect of Dietary Energy and Protein Levels on Growth of Lean Meat Growing and Fattening Pigs

Two group D×L×Y lean meat growing and fattening pigs of 60±1.5 kg and 90.0±1.5 kg in Guiyang were selected,each group had forty-eight pigs and the ratio of male to female was 1∶1.Four levels of energy and protein were supplied for each group;then determined the average daily gain(ADG),average daily feed intake(ADFI)and feed/gain(F/G).For the 60-90 kg pigs,dietary energy and protein levels showed significant(P<0.05)effect on ADG,ADFI and F/G.For the 90-120 kg pigs,dietary energy and protein levels showed significant(P<0.05)effect on ADFI and F/G.The suitable dietary energy and protein levels for 60-90 kg and 90-120 kg pigs were 13.90 and 14.62 MJ·kg-1,15.90% and 14.90%,respectively.The regression equations among ADG,intake of digestive energy(DEI)and crude protein(CPI)for 90-120 kg pigs gained by multiple regression analysis was ΔW=-12.772* DEI+23.467* CPI+351.156(R2=0.881,P<0.05).