Increased small intestinal fermentation is partly responsible for the anti-nutritive activity of non-starch polysaccharides in chickens
Increased small intestinal fermentation is partly responsible for the anti-nutritive activity of non-starch polysaccharides in chickens
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DOI：
10.1080/00071669608417891
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发表时间：
1996-07-01
影响因子：
2
通讯作者：
Annison, G
中科院分区：
文献类型：
--
作者：
Choct, M;Hughes, RJ;Annison, G
1.本研究探讨了可溶性非淀粉多糖在肉仔鸡日粮中抗营养作用的机理，着重探讨了粘度与肠道沿着发酵的相互关系。将分离的可溶性NSP添加到对照饮食中以实现高肠道粘度，并且使用商业聚糖酶实现NSP的体内解聚。添加可溶性非淀粉多糖显著（P < 0.01）提高了肠道粘度，降低了日粮的AME，抑制了鸡的生长和饲料利用率。富含NSP的饮食中添加酶可逆转不良反应，增加（P < 0.01）体重增加、FCE和AME。饲喂富含NSP的饲料和添加酶的相同饲料的鸡的粘度（mPa）的比较分别为：十二指肠11.9 v. 2.3;空肠78.3 v. 4.4和回肠409.3 v. 10.8。添加酶显著提高盲肠挥发性脂肪酸含量（P < 0.01），但抑制回肠发酵.显微镜检查显示，在喂食富含NSP的饲料的鸟类中，存在广泛的小肠发酵，该发酵被酶消化消除。添加一种合成抗生素（阿莫西林）没有任何有益的效果。目前的研究表明，当饮食中存在大量粘性NSP时，小肠中的发酵会增加，这对家禽的性能和健康不利。
1. The mechanism of the anti-nutritive activities of soluble non-starch polysaccharides in broiler diets was investigated with emphasis on the inter-relationship between viscosity and fermentation along the gut. Isolated soluble NSP were added to a control diet to effect high gut viscosity, and in vivo depolymerisation of the NSP was achieved using a commercial glycanase.2. Addition of soluble NSPs significantly (P < 0.01) increased gut viscosity, reduced the AME of the diet and depressed the growth and FCE of the birds. Enzyme supplementation of the NSP-enriched diet reversed the adverse effects, increasing (P < 0.01) weight gain, FCE and AME. Comparisons of the viscosities (mPa) in birds fed on the NSP-enriched diet and the same diet supplemented with enzyme were respectively: 11.9 v. 2.3 in the duodenum; 78.3 v. 4.4 in the jejunum and 409.3 v. 10.8 in the ileum.3. Caecal volatile fatty acid concentration was markedly (P < 0.01) elevated by enzyme supplementation, whereas ileal fermentation was inhibited.4. Microscopic examination revealed that, among birds fed on the NSP-enriched diet, there had been extensive small intestinal fermentation, which was eliminated by the enzyme supplementation.5. Addition of a synthetic antibiotic (Amoxil) had no beneficial effects.6. The current study demonstrated that increased fermentation occurs in the small intestine when a large amount of viscous NSPs is present in the diet and this is detrimental to the performance and well-being of poultry.