蛋白质源对山羊瘤胃微生物蛋白AA组成的影响

Effects of protein sources on AA profiles of microbial protein in goats rumen

以4只瘘管山羊作为试验动物,研究羽毛粉(A)、玉米蛋白粉(B)、豆粕(C)和鱼粉(D)等蛋白质源配合的混合日粮对瘤胃微生物蛋白AA组成模式的影响规律。采用4×4拉丁方设计进行试验。结果表明:部分种类AA的含量在原虫和细菌区系间和同一区系内不同蛋白质处理间差异显著。原虫的Val比例高于细菌的,而细菌的Lys则高于原虫。细菌的Arg,原虫的Met、Leu和His在蛋白质处理间差异显著。综上可见,瘤胃微生物AA组成是因蛋白质来源而变化的。

The objectives of these paper was to investigate how rumen microbial AA composition changed with protein sources.Four goats fitted with tureen cannula, were used in a 4×4 Latin square design. And diets were divided into 4 groups according to their nitrogen source, which was, respectively, plume meal （A）, corn gluten meal （B）, soybean meal （C）, and fish meal （D）.The results showed that, sig- nificant differences were found between protozoa and bacteria in some AA content. Protozoal Val content was higher than bacterial, while Lys content was high in bacteria. Additionally, significant differences in AA content were found within protozoa or bacteria, between treatments. For bacteria, significant difference was detected in Arg; for protozoa, Met, Leu, and His showed significant differences.All in all, AA profiles of rumun MCP were modified by protein sources.