Taxonomic and functional adaption of the gastrointestinal microbiome of goats kept at high altitude (4800 m) under intensive or extensive rearing conditions

文献类型： 外文期刊

第一作者： Zhang, Ke

作者： Zhang, Ke;Xu, Yangbin;Zhang, Chenguang;Li, Chao;Yang, Yuxin;Kalds, Peter;Wang, Xiaolong;Chen, Yulin;He, Chong;Jing, Xu;Wang, Meili;Suo, Langda;Wu, Yujiang;Song, Jiuzhou;Brugger, Daniel

作者机构：

关键词： microbiome; rumen; hindgut; grazing; goats; highland adaptation

期刊名称：FEMS MICROBIOLOGY ECOLOGY （ 影响因子：3.675； 五年影响因子：4.562 ）

ISSN： 0168-6496

年卷期： 2021 年 97 卷 3 期

页码：

收录情况： SCI

摘要： The gut microbiota composition is influenced by the diet as well as the environment in both wild and domestic animals. We studied the effects of two feeding systems on the rumen and hindgut microbiome of semi-feral Tibetan goats kept at high altitude (similar to 4800 m) using 16S rRNA gene and metagenomic sequencing. Intensive drylot feeding resulted in significantly higher zootechnical performance, narrower ruminal acetate: propionate ratios and a drop in the average rumen pH at slaughter to similar to 5.04. Hindgut microbial adaption appeared to be more diverse in the drylot group suggesting a higher influx of undegraded complex non-starch polysaccharides from the rumen. Despite their higher fiber levels in the diet, grazing goats exhibited lower counts of Methanobrevibacter and genes associated with the hydrogenotrophic methanogenesis pathway, presumably reflecting the scarce dietary conditions (low energy density) when rearing goats on pasture from extreme alpine environments. These conditions appeared to promote a relevant abundance of bacitracin genes. In parallel, we recognized a significant increase in the abundance of antibiotic resistance genes in the digestive tracts of drylot animals. In summary, this study provides a deeper insight into the metataxonomic and functional adaption of the gastrointestinal microbiome of goats subject to intensive drylot and extensive pasture rearing conditions at high altitude.

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