Huang K H, Li X, Ravindran V, Bryden W L
School of Animal Studies, University of Queensland, Gatton, Queensland 4343, Australia.
Poult Sci. 2006 Apr;85(4):625-34. doi: 10.1093/ps/85.4.625.
The apparent ileal digestibility of amino acids in 7 feed ingredients was determined using broilers, layers, and roosters. The ingredients included 3 cereals (wheat, sorghum, and corn), 3 oilseed meals (canola, cottonseed, and soybean meals), and 1 animal protein meal (meat and bone meal). Dietary protein in the assay diets was supplied solely by the test ingredient. All diets contained 20 g/kg of acid-insoluble ash as an indigestible marker, and each diet was offered ad libitum in mash form to 5 replicate pens of broilers and layers, and 4 replicate pens of roosters. The digestibility coefficients of individual amino acids for wheat, corn, and sorghum were higher (P < 0.05) in broilers than in layers and roosters. The digestibility of most amino acids for corn and sorghum was higher (P < 0.05) in roosters compared with those in layers, whereas the digestibility for wheat in layers and roosters was similar. In general, the digestibility of amino acids in canola meal, cottonseed meal, and meat and bone meal was similar among the 3 classes of chickens. The digestibility of amino acids in soybean meal was higher (P < 0.05) for layers compared with those for broilers and roosters but similar between broilers and roosters. These results suggest that the class of chickens significantly influenced the apparent ileal digestibility of amino acids in some feed ingredients.
利用肉鸡、蛋鸡和公鸡测定了7种饲料原料中氨基酸的表观回肠消化率。这些原料包括3种谷物（小麦、高粱和玉米）、3种油籽粕（油菜籽粕、棉籽粕和大豆粕）以及1种动物蛋白饲料（肉骨粉）。试验日粮中的膳食蛋白质仅由试验原料提供。所有日粮均含有20 g/kg的酸不溶性灰分作为难消化标记物，每种日粮均以粉料形式随意提供给5个重复栏的肉鸡和蛋鸡，以及4个重复栏的公鸡。肉鸡中小麦、玉米和高粱的单个氨基酸消化率系数高于（P<0.05）蛋鸡和公鸡。与蛋鸡相比，公鸡中玉米和高粱的大多数氨基酸消化率更高（P<0.05），而蛋鸡和公鸡中小麦的消化率相似。总体而言，3类鸡中油菜籽粕、棉籽粕和肉骨粉中氨基酸的消化率相似。与肉鸡和公鸡相比，蛋鸡中大豆粕的氨基酸消化率更高（P<0.05），但肉鸡和公鸡之间相似。这些结果表明，鸡的类别对某些饲料原料中氨基酸的表观回肠消化率有显著影响。
