Effect of slow-release urea on the composition of ruminal bacteria and fungi communities in yak
文献类型： 外文期刊
第一作者： Yan, X. T.
作者： Yan, X. T.;Yan, B. Y.;Ren, Q. M.;Dou, J. J.;Qiu, Q.;Wang, W. W.;Zhang, J. J.;Zhou, J. W.;Long, R. J.;Ding, L. M.;Han, J.;Li, Z. P.
作者机构：
关键词： Slow-release urea; Bacteria; Fungi; Yak; Glutamine and glutamate
期刊名称：ANIMAL FEED SCIENCE AND TECHNOLOGY （ 影响因子：3.247； 五年影响因子：3.806 ）
ISSN： 0377-8401
年卷期： 2018 年 244 卷
页码：
收录情况： SCI
摘要： Slow-release urea (SRU) is a cost-efficient form of nonprotein nitrogen, which is hydrolyzed and synthesized by rumen microorganisms, and affects ruminant production performance. Yaks have evolved efficient microbial protein synthesis on the Qinghai-Tibetan Plateau (QTP). Examining effects of SRU on rumen microbiota is important to understand the urea metabolism in rumen of yak, however, which has not been previously characterized. To this end, six healthy yaks were selected and randomly assigned to one of two dietary treatments: a basal diet containing 10 or 20 g/kg diet of SRU (designated LSRU and HSRU, respectively, n = 3 in each case). Rumen bacteria and fungi community based on 16S rRNA and ITS1 genes, respectively, were characterized through the next-generation sequencing. The average daily weight gain and feed efficiency for yaks fed the LSRU diet were better than for those fed the HSRU diet. The dominant bacterial genera were Prevotella 1, Rikenellaceae RC9 gut group, and Christensenellaceae R-7 group (accounting for 38.7, 8.73 and 2.51% of detected OTUs, respectively). Increasing SRU supply significantly decreased (P < 0.05) abundance of the phylum Chlorobi and genus Rikenellaceae RC9 gut group. The dominant fungal genera were Saccharomycopsis, Candida, and Pseudopithomyces (accounting for 22.44, 5.26 and 3.32% of detected OTUs, respectively). Increasing SRU supply significantly decreased (P < 0.05) abundance of Pichia, Geotrichum and Monographella genera. Furthermore, the predicted functions of D-glutamine and D-glutamate metabolism were significantly decreased (P < 0.05) with an increase in SRU. Overall, these results suggest that SRU has influenced rumen microbiota of yaks, which provides new insights in understanding the urea metabolism, and shed lights on the urea application of yaks and other ruminants lived at QTP.
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