日粮蛋白质水平对肉牛真胃营养物质流量和营养物质消化率的影响  

Effects of Dietary Protein Level on Abomasum Nutrient Flows and Nutrient Digestibility of Diets on Total Digestive Tract in Steers

作　　者：黄木家[1] 莫放[1] 徐萍[1] 姜军[1] 高博[1] 姜莉[1] 陈瑶[1] 

机构地区：[1]中国农业大学动物营养学国家重点实验室,北京100094

出　　处：《动物营养学报》2007年第5期528-533,共6页CHINESE JOURNAL OF ANIMAL NUTRITION

摘　　要：本文旨在研究日粮蛋白质水平对肉牛真胃食糜营养流量和营养物质表观消化率的影响。试验选择4头体重(650±20)kg,安装有瘤胃、真胃瘘管的荷斯坦(Holstein)公牛,按4×4拉丁方试验设计分别饲喂精粗比和进食量相同的4种蛋白质水平日粮,以三氧化二铬(Cr2O3)作真胃食糜标记物,全收粪法收集粪样,测定真胃食糜和粪便中的有机物(OM)、粗蛋白质(CP)、中性洗涤纤维(NDF)、酸性洗涤纤维(ADF)流量及在瘤胃内和真胃后段消化道(简称肠道)内的表观消化率。结果表明:日粮蛋白质水平对瘤胃及全消化道的OM、NDF和ADF表观消化率没有显著影响(P>0.05),日粮蛋白质水平显著影响真胃食糜的粗蛋白质量(P<0.05),但全消化道CP表观消化率没有差异(P>0.05)。The main objective of this experiment was to examine the effects of the percentage of crude protein in the diet on ruminal fermentation, nutrient passage to the small intestine, and nutrient digestibility. For this purpose, four Holstein steers fistulated in the rumen and abomasum were used in a 4 × 4 Latin square design at four treatments with 4 level of CP in diet. On an air-dry matter basis, diets contained 25% hay, 25% alfalfa and 50% concentrate. Digestibilities in the rumen and total tract of organic matter, neutral and acid detergent fiber were unaffected by increasing dietary CP from 11% to 17.5 % （P〉0.05）. Increasing dietary CP increased the ruminal outflow of CP fractions （P〈0.05）, but the total tract apparent digestion of CP were not significant among CP levels （P〉0.05）. Results of this study suggest that digestibility of OM and NDF was not different at the protein level in the diet.

关 键 词：肉牛 表观消化率 蛋白质水平 有机物 NDF ADF 

分 类 号：S828.5[农业科学—畜牧学]