Department of Animal Sciences, Purdue University, West Lafayette, IN 47907-2054, USA.
Poult Sci. 2010 Mar;89(3):545-50. doi: 10.3382/ps.2009-00485.
The apparent ileal amino acid digestibility of 6 feedstuffs, namely corn, wheat, corn distillers dried grains with solubles, canola meal, soybean meal (SBM), and meat and bone meal (MBM) were determined for White Pekin ducks in a 5-d experiment. The feedstuffs served as the sole source of amino acids in semipurified diets composed of dextrose, soy oil, Solka Floc, minerals, and vitamins, with the exception of corn and wheat, in which both lacked dextrose. The ducks received a standard duck starter diet during the first 14 d posthatch. On d 14, ducks were sorted by weight and allocated to 6 dietary treatments in a randomized complete block design. Each assay diet was fed to 8 replicates (6 ducks/replicate) from d 14 to 19 posthatch. Birds were killed on d 19 and digesta from the terminal ileum were collected. Ileal N digestibility was highest (P < 0.01) in SBM (88.3%) and lowest in MBM (72.4%). Ileal digestibility for all of the amino acids was highest in SBM among the feedstuffs. Lysine digestibility was highest (P < 0.01) for SBM followed by canola meal, corn, wheat, MBM, and distillers dried grains with soluble; the values were 90.3, 79.0, 78.0, 76.8, 75.6, and 69.2%, respectively. Methionine digestibility in SBM was highest (P < 0.01), whereas MBM had the lowest digestibility value for methionine (78.4%). For threonine, SBM (84.0%) had the highest digestibility and corn (61.6%) had the lowest digestibility (P < 0.01), but there were no differences among other feedstuffs. Ileal tryptophan digestibility was between 78.9 (MBM) and 93.0% (SBM). In conclusion, the data from the current study show that there are considerable differences among feedstuffs in the digestibility of their amino acids for ducks. Therefore, it is important to take the digestible amino acid content of feedstuffs into account during feed formulation.
在一项为期 5 天的试验中，确定了 6 种饲料（玉米、小麦、玉米酒糟及其可溶物、菜粕、豆粕和肉骨粉）对北京白鸭的表观回肠氨基酸消化率。这些饲料在半纯化日粮中作为唯一的氨基酸来源，日粮由葡萄糖、大豆油、Solka Floc、矿物质和维生素组成，除了玉米和小麦，这两种饲料都缺乏葡萄糖。鸭子在孵化后前 14 天接受标准鸭育雏日粮。第 14 天，根据体重将鸭子分成 6 个日粮处理组，采用完全随机区组设计。从第 14 天到 19 天，每个试验日粮分别给 8 个重复（每个重复 6 只鸭子）。孵化后第 19 天，处死鸟类并收集回肠末端的食糜。豆粕的回肠氮消化率最高（P < 0.01）（88.3%），肉骨粉最低（72.4%）。在这些饲料中，所有氨基酸的回肠消化率均以豆粕最高。赖氨酸消化率以豆粕最高（P < 0.01），其次是菜粕、玉米、小麦、肉骨粉和玉米酒糟及其可溶物，分别为 90.3%、79.0%、78.0%、76.8%、75.6%和 69.2%。豆粕的蛋氨酸消化率最高（P < 0.01），而肉骨粉的蛋氨酸消化率最低（78.4%）。苏氨酸的消化率以豆粕最高（84.0%），玉米最低（P < 0.01）（61.6%），但其他饲料之间没有差异。回肠色氨酸消化率在 78.9%（肉骨粉）和 93.0%（豆粕）之间。综上所述，本研究数据表明，鸭对不同饲料氨基酸的消化率存在很大差异。因此，在配方设计中，必须考虑饲料中可消化氨基酸的含量。
