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.

消化道的微生物數量受很多因素影響，但是最重要的一個因素似乎應該是腸道中的能量供應物質。這些供能物質在日糧中主要是提供能量，在腸道后段則是提供一定數量和種類的不可消化但是可以發酵的碳水化合物。不同的谷物中碳水化合物組成各異，因此也可以認為它們提供了各種不同的可發酵碳水化合物。

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.

日糧中高水平的可發酵纖維可以對豬有益，也可以對豬有害。這些纖維可以促進腸道中有益微生物的數量，這些有益微生物可以通過抑制病原菌的繁殖從而保護動物免受感染。此外，這些纖維同樣也可以作為能量供應物質為病原菌利用，從而增加動物對疾病的易感性。我們現在有很多數據支持后者的說法。

矮子

原作者提出很有意思觀點，就是有很多數據支持日糧中高水平的可發酵纖維增加動物對疾病的易感性。中國豬飼料纖維含量遠高于國外。望樓主繼續譯下去。

這兩段看似簡單，表達還是有些困難。如function，indigestible，lower gut or hindgut，commensal，Alternatively etc.

Anyway, u did a good job!