ABSTRACT The study was conducted to determine effects of a complex of fibre-degrading enzymes (xylanase, cellulase and β-glucanase) on nutrient digestibility, fibre fermentation and concentrations of short chain fatty acids (SCFA) at different parts of digestive tract in pigs fed different fibre-rich ingredients. A total of 36 barrows fitted with T-cannulas in the distal ileum (initial body weight of 41.1 ± 2.7 kg) were randomly allotted to six dietary treatments with three different high-fibre diets including maize bran (MB), sugar beet pulp (SBP) and soybean hulls (SH) with or without supplementation of fibre-degrading enzymes. Enzyme supplementation improved (p < 0.05) apparent ileal digestibility (AID) of dietary gross energy (GE), crude protein, dry matter (DM), organic matter (OM), total dietary fibre (TDF), neutral detergent fibre (NDF) and apparent total tract digestibility (ATTD) of dietary GE, DM, OM, TDF, insoluble dietary fibre (IDF) when pigs were fed MB, SBP or SH diets. When compared to the SBP and SH diets, the AID of GE, DM, ash, OM and NDF in diet MB was higher (p < 0.05), but the hindgut disappearance and ATTD of nutrients, except for ether extract and crude ash, were lower (p < 0.05). Enzyme supplementation increased acetate and total SCFA concentrations in ileal digesta and faeces of pigs. In conclusion, enzyme addition improved IDF fermentation and SCFA concentration in the whole intestine of pigs, and there was a large variation of digestibility of fibre components among MB, SH and SBP owing to their different fibre composition. Therefore, fibre-degrading enzymes should be applied to fibrous diets to improve efficient production of swine, especially considering low fibre digestibility of fibre-rich ingredients.

中文翻译：

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纤维降解酶联合不同纤维来源对猪回肠和全道养分消化率及发酵产物的影响

摘要 本研究旨在确定复合纤维降解酶（木聚糖酶、纤维素酶和 β-葡聚糖酶）对饲喂猪的消化道不同部位的营养消化率、纤维发酵和短链脂肪酸 (SCFA) 浓度的影响。不同的富含纤维的成分。总共 36 只在回肠末端装有 T 型插管的手推车（初始体重为 41.1 ± 2.7 kg）被随机分配到六种膳食处理中，其中包含三种不同的高纤维膳食，包括玉米麸 (MB)、甜菜浆 (SBP) ) 和大豆壳 (SH)，添加或不添加纤维降解酶。酶补充剂改善了（p < 0.05）日粮总能量（GE）、粗蛋白、干物质（DM）、有机物（OM）、总膳食纤维（TDF）的表观回肠消化率（AID），当猪饲喂 MB、SBP 或 SH 日粮时，中性洗涤纤维 (NDF) 和日粮 GE、DM、OM、TDF、不溶性膳食纤维 (IDF) 的表观总消化率 (ATTD)。与 SBP 和 SH 日粮相比，日粮 MB 中 GE、DM、灰分、OM 和 NDF 的 AID 较高（p < 0.05），但除乙醚提取物和粗灰分外，后肠消失和营养物质的 ATTD 均较低较低（p < 0.05）。酶补充剂增加了猪回肠食糜和粪便中醋酸盐和总 SCFA 的浓度。总之，酶的添加改善了猪全肠中IDF的发酵和SCFA浓度，MB、SH和SBP之间由于纤维成分不同，纤维成分的消化率存在较大差异。所以，