寡肽对肉仔鸡蛋白质、能量沉积及相关生理指标的影响

为测定不同蛋白源对肉仔鸡能量、蛋白质沉积的影响,选择14日龄AA肉仔鸡180只,随机分为3组,每组6个重复。分别饲喂由游离氨基酸、寡肽和酪蛋白作为氮源的纯合日粮,在28日龄屠宰测定机体羽毛、胴体及全身蛋白质、能量沉积。结果显示,羽毛能量沉积量分别为0.083、0.075和0.095 MJ/kg,差异不显著(P>0.05);胴体能量沉积量分别为0.5 5、0.7 1和0.9 4 MJ/kg,差异显著(P<0.0 5);全身能量沉积量分别为0.6 5、0.7 8和1.0 3 MJ/kg,差异显著(P<0.05);羽毛蛋白质沉积量分别为2.75、2.87和4.08 g,差异显著(P<0.05);胴体蛋白质沉积量分别为1 5.0 1、1 8.2 5和2 0.0 8 g,差异显著(P<0.0 5);全身蛋白质沉积量分别为1 7.7 5、2 1.1 2和2 4.1 6 g,差异显著(P<0.0 5)。血清检验表明,与游离氨基酸相比,寡肽和酪蛋白会显著提高肉仔鸡血清转氨酶活性(P<0.05),降低尿酸含量(P<0.05)。

Effects of Oligopeptide on the Protein, Energy Deposition and Related Metablic Indices of Broilers

To study the effects of different protein resources on protein and energy deposition,one hundred and eighty 14-day old broilers were randomly divided into three groups with 6 replications.Three kinds of purified diets of which protein were FAA,oligopeptide and casein respectively were fed.The results showed that 1) the energy deposition of feather,carcass and whole body were 0.083 MJ/kg,0.075 MJ/kg and 0.095 MJ/kg(P>0.05);0.55 MJ/kg,0.71 MJ/kg and 0.94 MJ/kg(P<0.05);0.65 MJ/kg,0.78 MJ/kg and 1.03 MJ/kg(P<0.05),respectively;2) the protein deposition of feather,carcass and whole body were 2.75 g,2.87 g and 4.08 g(P<0.05);15.01 g, 18.25 g and 20.08 g(P<0.05);17.75 g,21.12 g and 24.16 g(P<0.05),respectively;3) compared with FAA group,the ALT and AST level in serum of oligopeptide and casein group increased while the UA content decreased(P<0.05).