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首页> 外文期刊>World's Poultry Science journal >Non-starch polysaccharide degrading enzymes in poultry diets: influence ofingredients on the selection of activities
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Non-starch polysaccharide degrading enzymes in poultry diets: influence ofingredients on the selection of activities

机译：家禽日粮中非淀粉多糖降解酶：成分对活性选择的影响

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The use of non-starch polysaccharide (NSP) degrading enzymes as feed additives has consolidated around their application to barley- and wheat-based diets for broiler chicks. Only with this application has a good understanding of their mode of action been developed and reasons for their effectiveness established. Most of the effect of NSP degrading enzymes can be ascribed to reversing the increase in digesta viscosity caused by polysaccharides leached from grain cell walls. Because digesta viscosity is greatest in the youngest birds and decreases with age, the value of supplementary enzymes for older birds is limited to secondary and less well defined effects. These include the release of nutrients otherwise entrapped in the cellular matrix of the feed. Maize alone amongst the commonly used cereals does not appear to release soluble NSPs in amounts sufficient to produce a detectable depression in performance. However, maize is not a homogeneous commodity and for some samples this may not be the case. Use of NSP degrading enzymes with legume seeds can improve nitrogen retention but effects are generally small. The structures of the soyabean NSPs, particularly the pectic polysaccharides, appear unique and existing commercial formulations are not recognised to contain enzymes capable of their degradation. With the present knowledge of soyabean polysaccharide structure, more informed formulation of enzyme products for use with soyabean should enable better responses to be achieved. When coupled with the lesser response from maize, this could allow the effective use of enzyme additives with maize-soyabean diets.
机译：非淀粉多糖（NSP）降解酶作为饲料添加剂的应用已围绕它们在肉鸡大麦和小麦日粮中的应用而得到巩固。只有使用此应用程序，才能充分了解其作用方式并确定其有效性的原因。 NSP降解酶的大多数作用可以归因于逆转从谷物细胞壁浸出的多糖引起的消化粘度的增加。因为消化粘度在最年轻的鸟类中最大，并且随着年龄的增长而降低，所以对于较老的鸟类来说，补充酶的价值仅限于继发性作用和定义不明确的作用。这些包括释放否则会截留在饲料细胞基质中的营养物质。在常用谷物中，仅玉米似乎不会释放出足以产生可检测的性能下降量的可溶性NSP。但是，玉米不是同质商品，对于某些样品来说可能并非如此。将NSP降解酶与豆类种子一起使用可以改善氮的保留，但效果通常很小。大豆NSP的结构，特别是果胶多糖，似乎是独特的，现有的商业配方并未被认为含有能够降解的酶。利用大豆多糖结构的当前知识，与大豆一起使用的酶产品的更知情的配方应该能够实现更好的响应。当加上玉米的响应较少时，这可以允许在玉米-大豆日粮中有效使用酶添加剂。

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