２０世纪８０年代初，随着微生态学理论的发展，人们对肠道有益微生物的功能日趋重视，动物营养学家考虑通过在饲料中添加一些既不能为动物自身吸收与利用，又不能为肠道大部分有害微生物利用，只能被肠道有益微生物吸收的物质，来调节动物肠道微生物区系，以增加有益微生物的 In the early 1980s, with the development of microecology theory, people pay more and more attention to the function of gut beneficial microorganisms. Animal nutritionists consider that by adding some in the feed, they can not be absorbed and utilized by the animals themselves, Most harmful microorganisms utilize only those substances that are absorbed by the beneficial microorganisms in the intestine to regulate the gut microbiota of animals to increase the beneficial microbial