The aim was to test additivity of apparent ileal digestibility (AID) and standardized ileal digestibility (SID) of amino acids (AAs) in mixed diets for Ross 308 broiler chickens. Two hundred and eighty-eight, 20-d-old male broiler chickens were assigned to one of six diets, with six birds per cage using a randomized complete block design. The diets consisted of a nitrogen-free diet, three diets containing corn, soybean meal (SBM), and corn distillers dried grains with solubles (CDDGS) as the sole source of nitrogen, respectively, and two mixed diets containing corn, SBM or CDDGS. Chromic oxide was added to the diets as an indigestible index. On day 24, birds were euthanized for ileal digesta collection. Relative proportion of the basal endogenous loss of AAs to total ileal outflow of AAs in corn was greater (p < 0.05) than that of SBM and CDDGS. For the corn-SBM and corn-SBM-CDDGS mixed diets, the AID of AAs differed (p < 0.05) from the predicted values. No difference was observed between the measured and predicted SID of AA. In conclusion, the SID of AAs is more additive in mixed diets containing corn, SBM, or CDDGS compared to AID values.

中文翻译：

---

日粮中含有玉米，大豆粉和玉米蒸馏器干谷粒的带糊剂的回肠氨基酸消化率的加性。

目的是测试Ross 308肉鸡在混合日粮中的表观回肠消化率（AID）和氨基酸（AAs）的标准化回肠消化率（SID）的可加性。将288只20日龄雄性肉鸡分配为六种日粮中的一种，每只笼养六只鸡，采用随机完整块设计。这些饮食包括无氮饮食，三种包含玉米，豆粕（SBM）和玉米蒸馏器干粮的谷物，其中可溶性谷物（CDDGS）作为唯一的氮源，以及两种混合饮食包含玉米，SBM或CDDGS 。饮食中添加了氧化铬作为不易消化的指标。在第24天，对家禽实施安乐死以收集回肠消化物。玉米中AA的内源性基础损失相对于回肠总回肠流出量的相对比例更大（p<0.05）高于SBM和CDDGS。对于玉米-SBM和玉米-SBM-CDDGS混合日粮，AA的AID与预测值有所不同（p <0.05）。在AA的实测和预测的SID之间未观察到差异。总之，与AID值相比，AAS的SID在含有玉米，SBM或CDDGS的混合日粮中更具添加性。