Dynamics of methanogenesis,ruminal fermentation and fiber digestibility in ruminants following elimination of protozoa: a meta-analysis

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英文篇名：Dynamics of methanogenesis,ruminal fermentation and fiber digestibility in ruminants following elimination of protozoa: a meta-analysis 作者：Zongjun ; Li ; Qi ; Deng ; Yangfan ; Liu ; Tao ; Yan ; Fei ; Li ; Yangchun ; Cao ; Junhu ; Yao 英文作者：Zongjun Li;Qi Deng;Yangfan Liu;Tao Yan;Fei Li;Yangchun Cao;Junhu Yao;College of Animal Science and Technology,Northwest A&F University;State Key Laboratory of Genetic Resources and Evolution,Kunming Institute of Zoology,Chinese Academy of Sciences;College of Pastoral Agricultural Science and Technology,Lanzhou University; 英文关键词：Defaunation;;Fiber digestibility;;Meta-analysis;;Methane production;;Rumen fermentation 中文刊名：XMSW 英文刊名：畜牧与生物技术杂志(英文版) 机构：College of Animal Science and Technology,Northwest A&F University;State Key Laboratory of Genetic Resources and Evolution,Kunming Institute of Zoology,Chinese Academy of Sciences;College of Pastoral Agricultural Science and Technology,Lanzhou University; 出版日期：2019-03-15 出版单位：Journal of Animal Science and Biotechnology 年：2019 期：v.10 基金：supported by the National Key Research and Development Program of China(grant number:2017YFD0500500) 语种：英文; 页：XMSW201901014 页数：9 CN：01 ISSN：11-5967/S 分类号：154-162

摘要

Background: Ruminal microbes are vital to the conversion of lignocellulose-rich plant materials into nutrients for ruminants.Although protozoa play a key role in linking ruminal microbial networks,the contribution of protozoa to rumen fermentation remains controversial; therefore,this meta-analysis was conducted to quantitatively summarize the temporal dynamics of methanogenesis,ruminal volatile fatty acid(VFA) profiles and dietary fiber digestibility in ruminants following the elimination of protozoa(also termed defaunation).A total of 49 studies from 22 publications were evaluated.Results: The results revealed that defaunation reduced methane production and shifted ruminal VFA profiles to consist of more propionate and less acetate and butyrate,but with a reduced total VFA concentration and decreased dietary fiber digestibility.However,these effects were diminished linearly,at different rates,with time during the first few weeks after defaunation,and eventually reached relative stability.The acetate to propionate ratio and methane production were increased at 7 and 11 wk after defaunation,respectively.Conclusions: Elimination of protozoa initially shifted the rumen fermentation toward the production of more propionate and less methane,but eventually toward the production of less propionate and more methane over time.
        Background: Ruminal microbes are vital to the conversion of lignocellulose-rich plant materials into nutrients for ruminants.Although protozoa play a key role in linking ruminal microbial networks,the contribution of protozoa to rumen fermentation remains controversial; therefore,this meta-analysis was conducted to quantitatively summarize the temporal dynamics of methanogenesis,ruminal volatile fatty acid(VFA) profiles and dietary fiber digestibility in ruminants following the elimination of protozoa(also termed defaunation).A total of 49 studies from 22 publications were evaluated.Results: The results revealed that defaunation reduced methane production and shifted ruminal VFA profiles to consist of more propionate and less acetate and butyrate,but with a reduced total VFA concentration and decreased dietary fiber digestibility.However,these effects were diminished linearly,at different rates,with time during the first few weeks after defaunation,and eventually reached relative stability.The acetate to propionate ratio and methane production were increased at 7 and 11 wk after defaunation,respectively.Conclusions: Elimination of protozoa initially shifted the rumen fermentation toward the production of more propionate and less methane,but eventually toward the production of less propionate and more methane over time.

引文

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