不同蛋白水平对犊牛生长、营养代谢及氨基酸消化率的影响  

Effect of Different Protein Levels on the Growth,Nutrient Utilization and Amino Acids Digestibility of Dairy Calves

作　　者：李辉[1] 刁其玉[1] 张乃锋[1] 

机构地区：[1]中国农业科学院饲料研究所,北京100081

出　　处：《畜牧兽医学报》2008年第11期1510-1516,共7页ACTA VETERINARIA ET ZOOTECHNICA SINICA

基　　金：国家科技攻关计划子课题"奶牛营养调控及高效饲养技术研究"(2006BAD04A03-03)

摘　　要：研究不同蛋白水平代乳品对哺乳期犊牛生长发育、常规营养物质消化代谢及氨基酸消化的影响。选15头新生健康荷斯坦犊牛分为3组,分别饲喂蛋白含量为18%、22%及26%的代乳品,记为LP、MP及HP组。结果发现,MP组犊牛体增重高于其余2组(P<0.05),3组犊牛的平均日增重分别为598.10、829.52及628.57 g/d。3组犊牛对日粮DM、EE及Ash的表观消化率无显著差异(P>0.05),而MP组犊牛对日粮CP的消化率较高(P<0.05)。摄入N和粪N随日粮蛋白含量增加而增多(P<0.05),而尿N不受日粮蛋白水平的影响(P>0.05)。MP组犊牛对钙、磷的存留量和存留率均高于其余2组(P<0.05)。3种代乳品的总氨基酸消化率分别为82.73%、83.41%及79.45%,蛋白水平对3组犊牛氨基酸(除丙氨酸外)消化率的影响不显著(P>0.05)。结果表明,蛋白含量为22%的代乳品对犊牛的增重效果和营养物质利用率优于其余2组。This study was designed to examine the effects of different dietary protein levels on growth performance, nutrients utilization, and amino acid （AA） digestibility of early-weaning dairy calves. Fifteen healthy new born calves were randomly allotted into three experimental groups and fed three kinds of milk replacers with different protein levels （18%, 22% and 26%） respectively, labeled as LP, MP and HP group. The results showed that the body weight （BW） gain of MP group was higher than that of other groups （P〈0.05）, the ADG of three groups were 598.10, 829.52 and 628.57 g/d, respectively. The apparent digestibility of DM, EE and Ash were no difference among three groups （P〉0.05）, however, the apparent digestibility of CP in MP group was higher （P〈0. 05）. Intake N and Fecal N increased as dietary protein content increasing （P〈0.05）, however, Urine N was unaffected by dietary CP levels significantly （P〉0.05）. The retained Ca, P and expressed as a percentage of intake N in MP group were all higher than that in other groups （P〈 0.05）. The average digestibility of the total AA were 82.73%, 83.41% and 79.45% in LP, MP and HP groups, respectively, and the digestibility of amino acids（except for Ala） were no effected by CP levels （P〉0.05）. It was concluded that milk replacer with 22% CP produced higher body weight gain and better utilization of nutrients in comparison with lower protein and higher protein contents milk replacer.

关 键 词：犊牛 蛋白质 氨基酸 代乳品 消化率 

分 类 号：S816.32[农业科学—饲料科学]