Adeola Olayiwola, Ragland Darryl
Department of Animal Sciences, Purdue University, West Lafayette 47907, USA.
Department of Veterinary Clinical Sciences, Purdue University, West Lafayette 42054, USA.
Anim Nutr. 2016 Dec;2(4):262-266. doi: 10.1016/j.aninu.2016.07.008. Epub 2016 Aug 3.
The objective of the experiment reported here was to investigate and compare the amino acid (AA) digestibility of distillers' dried grains (DDG), distillers' dried grains with solubles (DDGS), high protein distillers' dried grains (HP-DDG), and high protein distillers' dried grains with solubles (HP-DDGS) in growing pigs. Five semi-purified diets consisting of DDG, DDGS, HP-DDG, HP-DDGS, and nitrogen-free diet (NFD) were fed to pigs fitted with simple T-cannula for 5 observations per diet. Endogenous losses of AA at the terminal ileum of pigs that received the NFD were used to calculate standardized ileal digestibility (SID) of AA from apparent ileal digestibility (AID) of AA. The AID of Lys in DDGS was lower ( < 0.05) than that in DDG, which was also lower ( < 0.05) than that in HP-DDG. There were no differences in AID of Met among DDG, DDGS and HP-DDGS, but was greater ( < 0.05) in HP-DDG than in DDG or DDGS. The AID of Thr in HP-DDG was greater ( < 0.05) than that in DDGS but not different from that in DDG or HP-DDGS. The branched-chain AA Ile and Leu had greater ( < 0.05) AID in HP-DDG than in DDG, DDGS or HP-DDGS, and there was no difference among DDG, DDGS, and HP-DDGS. The AID of Trp in DDG and DDGS or HP-DDG and HP-DDGS were not different, but the AID of Trp in HP-DDGS was greater ( < 0.05) than that of DDGS. The greatest SID of the indispensable AA was in HP-DDG. Except for Arg and Lys in which DDG had greater ( < 0.05) digestibility, there was no difference between DDG and DDGS in the SID of the indispensable AA. The SID of Lys in DDG was greater ( < 0.05) than that of DDGS but there was no difference between that of DDG and HP-DDGS. Only His, Ile, and Met had lower ( < 0.05) SID in HP-DDGS than HP-DDG within the indispensable AA. The SID of Ala, Asp, Cys, Glu, Gly, Ser and Tyr were lower ( < 0.05) in DDGS than in HP-DDG. There SID of dispensable AA in DDG was not different from that of HP-DDGS. The current study provided apparent and standardized ileal amino acids digestibility values for traditional and high-protein corn distillers' dried grains coproducts for use in formulating swine diets. Amino acid digestibility was generally higher in HP-DDG than in other tested co-products of the dry grind processing of corn for ethanol.
本文报道的实验目的是研究并比较酒糟（DDG）、带可溶物的酒糟（DDGS）、高蛋白酒糟（HP-DDG）和高蛋白带可溶物的酒糟（HP-DDGS）在生长猪体内的氨基酸（AA）消化率。将由DDG、DDGS、HP-DDG、HP-DDGS和无氮日粮（NFD）组成的五种半纯合日粮喂给安装了简单T型套管的猪，每种日粮进行5次观测。接受NFD的猪回肠末端的AA内源损失用于从AA的表观回肠消化率（AID）计算AA的标准回肠消化率（SID）。DDGS中赖氨酸的AID低于DDG（P<0.05），而DDG中的赖氨酸AID也低于HP-DDG（P<0.05）。DDG、DDGS和HP-DDGS之间蛋氨酸的AID没有差异，但HP-DDG中的蛋氨酸AID高于DDG或DDGS（P<0.05）。HP-DDG中苏氨酸的AID高于DDGS（P<0.05），但与DDG或HP-DDGS中的苏氨酸AID没有差异。支链氨基酸异亮氨酸和亮氨酸在HP-DDG中的AID高于DDG、DDGS或HP-DDGS（P<0.05），而DDG、DDGS和HP-DDGS之间没有差异。DDG和DDGS或HP-DDG和HP-DDGS中色氨酸的AID没有差异，但HP-DDGS中色氨酸的AID高于DDGS（P<0.05）。必需氨基酸中最大的SID出现在HP-DDG中。除了DDG中精氨酸和赖氨酸的消化率较高（P<0.05）外，DDG和DDGS在必需氨基酸的SID方面没有差异。DDG中赖氨酸的SID高于DDGS（P<0.05），但DDG和HP-DDGS中赖氨酸的SID没有差异。在必需氨基酸中，只有组氨酸、异亮氨酸和蛋氨酸在HP-DDGS中的SID低于HP-DDG（P<0.05）。DDGS中丙氨酸、天冬氨酸、半胱氨酸、谷氨酸、甘氨酸、丝氨酸和酪氨酸的SID低于HP-DDG（P<0.05）。DDG中可消化氨基酸的SID与HP-DDGS没有差异。本研究提供了传统和高蛋白玉米酒糟副产品在配制猪日粮时的表观和标准回肠氨基酸消化率值。HP-DDG中的氨基酸消化率通常高于玉米干法加工乙醇的其他测试副产品。
