Cereal

monica

Cereal

J. E. Pettigrew
Microbial populations in the digestive tract are influenced by many factors, but one of the most important is likely to be the supply of energy substrate present in the tract. That substrate supply is largely a function of the diet; the supply in the lower tract is largely a function of the amount and type of indigestible but fermentable carbohydrates in the diet. Different cereal grains have widely different carbohydrate components, so they should be expected to result in widely different supplies of fermentable carbohydrates in the lower gut.

消化道的微生物数量受很多因素影响，但是最重要的一个因素似乎应该是肠道中的能量供应物质。这些供能物质在日粮中主要是提供能量，在肠道后段则是提供一定数量和种类的不可消化但是可以发酵的碳水化合物。不同的谷物中碳水化合物组成各异，因此也可以认为它们提供了各种不同的可发酵碳水化合物。

A high level of fermentable fiber in the diet may have either beneficial or detrimental effects on the pig. It may promote the development of a large population of commensal bacteria, which protect the pig from entertic infection by inhibiting the growth of pathogens. Alternatively, it may serve as an energy substrate for pathogens and therefore increase susceptibility to disease. Our recent data provide general support for the latter.

日粮中高水平的可发酵纤维可以对猪有益，也可以对猪有害。这些纤维可以促进肠道中有益微生物的数量，这些有益微生物可以通过抑制病原菌的繁殖从而保护动物免受感染。此外，这些纤维同样也可以作为能量供应物质为病原菌利用，从而增加动物对疾病的易感性。我们现在有很多数据支持后者的说法。

矮子

原作者提出很有意思观点，就是有很多数据支持日粮中高水平的可发酵纤维增加动物对疾病的易感性。中国猪饲料纤维含量远高于国外。望楼主继续译下去。

这两段看似简单，表达还是有些困难。如function，indigestible，lower gut or hindgut，commensal，Alternatively etc.

Anyway, u did a good job!