Institute of Animal Science, University of Hohenheim, 70599 Stuttgart, Germany.
TUM School of Life Sciences Weihenstephan, Technical University of Munich, 85354 Freising, Germany.
Poult Sci. 2023 May;102(5):102580. doi: 10.1016/j.psj.2023.102580. Epub 2023 Feb 14.
This study investigated the variation in amino acid (AA) digestibility and MEn of 18 samples of solvent-extracted soybean meal (SBM; 6 European, 7 Brazilian, 2 Argentinian, 2 North American, 1 Indian) in cecectomized laying hens. The experimental diets contained either 300 g/kg of cornstarch or one of the SBM samples. Pelleted diets were fed to 10 hens in two 5 × 10 row-column designs so that 5 replicates were obtained from each diet during 5 periods. A regression approach and the difference method were used to determine AA digestibility and MEn, respectively. The variation in the digestibility of SBM differed among AA with ranges in digestibility of 6 to 12%-units for most AA. Among the first-limiting AA, the digestibility was 87 to 93%, 63 to 86%, 85 to 92%, 79 to 89%, and 84 to 95% for Met, Cys, Lys, Thr, and Val, respectively. The range of MEn for the SBM samples was 7.5 to 10.5 MJ/kg DM. Indicators of SBM quality (including trypsin inhibitor activity, KOH solubility, urease activity, and in vitro N solubility) and analyzed SBM constituents were significantly correlated (P ≤ 0.05) with AA digestibility or MEn only in a few cases. No differences were observed in AA digestibility and MEn between countries of origins, except low digestibility of some AA and MEn for the 2 Argentinian SBM samples. These results suggest that the precision of feed formulation benefits from considering the variations in AA digestibility and MEn. Often used indicators for SBM quality and analyzed constituents were not suitable to explain variations in AA digestibility and MEn, suggesting that AA digestibility and MEn are determined by other factors.
本研究在去盲肠产蛋鸡中研究了 18 种溶剂萃取大豆粕（SBM；6 种欧洲、7 种巴西、2 种阿根廷、2 种北美、1 种印度）样品的氨基酸（AA）消化率和代谢能（MEn）的变化。实验日粮含有 300g/kg 的玉米淀粉或其中一种 SBM 样品。在两个 5×10 行-列设计中，将颗粒饲料喂给 10 只母鸡，使每种日粮在 5 个时期获得 5 个重复。采用回归方法和差值法分别确定 AA 消化率和 MEn。SBM 消化率的变化在 AA 之间存在差异，大多数 AA 的消化率范围为 6 到 12%。在第一限制 AA 中，Met、Cys、Lys、Thr 和 Val 的消化率分别为 87%到 93%、63%到 86%、85%到 92%、79%到 89%和 84%到 95%。SBM 样品的 MEn 范围为 7.5 到 10.5MJ/kg DM。SBM 质量指标（包括胰蛋白酶抑制剂活性、KOH 溶解度、脲酶活性和体外 N 溶解度）和分析的 SBM 成分仅在少数情况下与 AA 消化率或 MEn 显著相关（P≤0.05）。除了 2 种阿根廷 SBM 样品的一些 AA 消化率和 MEn 较低外，来自不同国家的 SBM 样品的 AA 消化率和 MEn 没有差异。这些结果表明，饲料配方的精度受益于考虑 AA 消化率和 MEn 的变化。通常用于 SBM 质量的指标和分析成分不适合解释 AA 消化率和 MEn 的变化，这表明 AA 消化率和 MEn 由其他因素决定。
