The objective of this study was to determine the differences in response to distillers dried grains with solubles (DDGS) level under constant nutrient or floating nutrient concentrations. A total of 21 ileal-cannulated gilts (33.1 ± 0.4 kg body weight) were randomly allotted to one of seven dietary treatments in a 3-period incomplete Latin square design (n = 9). Treatments consisted of a 0% DDGS basal diet, plus diets containing 15%, 30%, or 45% DDGS. Diets were formulated using one of two different formulation methods: 1) constant nutrient (CNU) where nutrients were held equal to the basal diet or 2) constant ingredients (CIN) where DDGS were added at the expense of corn and all other ingredients remained constant, so nutrient levels were allowed to “float.” Chromic oxide was added to the diets at 0.5% as an indigestible marker. Increasing the level of DDGS decreased the apparent ileal digestibility (AID) of dry matter (DM), gross energy (GE), starch, dispensable amino acids (AA), and fiber components (P < 0.050). The decrease in the AID of Lys, Met, Thr, and Trp was more pronounced under CNU compared with the CIN formulation method (P < 0.050). The decrease in the AID of hemicellulose was less pronounced under CNU compared with the CIN formulation method (P = 0.045). There was a DDGS level × formulation method interaction for the AID of acid hydrolyzed ether extract (AEE; P = 0.015); for the CNU formulation method, increasing level of DDGS decreased the AID of AEE from 0% to 30% and remained similar from 30% to 45% DDGS, whereas the CIN had no effect on the AID of AEE. Increasing the level of DDGS decreased the apparent total tract digestibility (ATTD) of DM, GE, and fiber components (P < 0.050), except for acid detergent fiber, which was not affected. The decrease in the ATTD of insoluble dietary fiber and total dietary fiber was less pronounced under CNU compared with CIN (P < 0.050). The ATTD of AEE decreased for CNU compared with CIN (P < 0.010). In conclusion, increasing the insoluble fiber level in the form of DDGS decreased the digestibility of most dietary components, including DM, GE, starch, insoluble fiber, and AA. The CNU and CIN formulation methods are equivalent when evaluating the digestibilities of DM, GE, starch, crude protein, and AA (when they were not added in purified synthetic forms). Differences between CNU and CIN formulation methods were detected for the digestibility of insoluble fiber, fat, and essential AA (when added as crystalline AA).

中文翻译：

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增加不溶性纤维含量和日粮配制方法对生长猪能量和营养消化率的影响。

这项研究的目的是确定在恒定养分或漂浮养分浓度下，酒糟对可溶物（DDGS）的反应差异。在3个周期的不完全拉丁方形设计中，将总共21个回肠插管小母猪（33.1±0.4千克体重）随机分配给7种饮食处理之一（n = 9）。治疗包括0％DDGS基础饮食，以及含15％，30％或45％DDGS的饮食。日粮采用两种不同的配制方法之一进行配制：1）恒定营养素（CNU），其营养成分等于基础饮食，或者2）恒定成分（CIN）添加了DDGS却以玉米为代价的情况，而所有其他成分保持不变，因此允许营养水平“浮动”。饮食中添加了0.5％的氧化铬作为难消化的标记。DDGS含量的增加降低了干物质（DM），总能量（GE），淀粉，可分配氨基酸（AA）和纤维成分的表观回肠消化率（AID）（P <0.050）。与CIN配制方法相比，CNU下Lys，Met，Thr和Trp的AID降低更为明显（P <0.050）。与CIN配制方法相比，CNU下半纤维素的AID降低不太明显（P= 0.045）。酸水解醚提取物的AID有DDGS含量×配方方法的相互作用（AEE ; P = 0.015）; 对于CNU配方方法，增加DDGS的水平会使AEE的AID从0％降低到30％，并保持相似的DDGS从30％到45％，而CIN对AEE的AID没有影响。DDGS含量的增加会降低DM，GE和纤维成分的表观总消化率（ATTD）（P <0.050），但酸性洗涤剂纤维除外，这不受影响。与CIN相比，CNU下不溶性膳食纤维和总膳食纤维的ATTD减少幅度较小（P <0.050）。与CIN相比，CNU的AEE的ATTD降低（P<0.010）。总之，以DDGS形式增加不溶性纤维的含量会降低大多数膳食成分（包括DM，GE，淀粉，不溶性纤维和AA）的消化率。在评估DM，GE，淀粉，粗蛋白和AA的消化率时（当未以纯化的合成形式添加时），CNU和CIN的配制方法是等效的。检测到CNU和CIN配制方法之间在不溶性纤维，脂肪和必需AA（当以结晶AA添加时）的消化率方面存在差异。