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| 1 | Assessing the relationship between the rumen microbiota and feed efficiency in Nellore steers显示文摘Background:Ruminants rely upon a complex community of microbes in their rumen to convert host-indigestible feed into nutrients.However,little is known about the association between the rumen microbiota and feed efficiency traits in Nellore(Bos indicus)cattle,a breed of major economic importance to the global beef market.Here,we compare the composition of the bacterial,archaeal and fungal communities in the rumen of Nellore steers with high and low feed efficiency(FE)phenotypes,as measured by residual feed intake(RFI).Results:The Firmicutes to Bacteroidetes ratio was significantly higher(P<0.05)in positive-RFI steers(p-RFI,low feed efficiency)than in negative-RFI(n-RFI,high feed efficiency)steers.The differences in bacterial composition from steers with high and low FE were mainly associated with members of the families Lachnospiraceae,Ruminococcaceae and Christensenellaceae,as well as the genus Prevotella.Archaeal community richness was lower(P<0.05)in p-RFI than in n-RFI steers and the genus Methanobrevibacter was either increased or exclusive of p-RFI steers.The fungal genus Buwchfawromyces was more abundant in the rumen solid fraction of n-RFI steers(P<0.05)and a highly abundant OTU belonging to the genus Piromyces was also increased in the rumen microbiota of highefficiency steers.However,analysis of rumen fermentation variables and functional predictions indicated similar metabolic outputs for the microbiota of distinct FE groups.Conclusions:Our results demonstrate that differences in the ruminal microbiota of high and low FE Nellore steers comprise specific taxa from the bacterial,archaeal and fungal communities.Biomarker OTUs belonging to the genus Piromyces were identified in animals showing high feed efficiency,whereas among archaea,Methanobrevibacter was associated with steers classified as p-RFI.The identification of specific RFI-associated microorganisms in Nellore steers could guide further studies targeting the isolation and functional characterization of rumen microbes potentially important for the energy-harvesting efficiency of ruminants. | Déborah Romaskevis Gomes Lopes Márcio de Souza Duarte Alex J.La Reau Ibrahim Zuniga Chaves Tiago Antônio de Oliveira Mendes Edenio Detmann Cláudia Braga Pereira Bento Maria Eugênia Zerlotti Mercadante Sarah Figueiredo Martins Bonilha Garret Suen Hilário Cuquetto Mantovani | 2021 | Journal of Animal Science and Biotechnology2021，12，4： | 3 |
| 2 | Detection of Mycoplasma pneumoniae by using the pol ymerase chain reaction显示文摘 | Bernet C Garret M de Barbeyrac B | 1989 | J Clin Microbiol1989，27，11： | 1 |
| 3 | Flow stressanomalies in y/yr two phase Co-Al-W-based alloys 显示文摘 | Akane Suzuki Garret C DeNoIf Tresa M Pollock | 2007 | ScriptaMaterialia2007，56，5： | 1 |
| 4 | Formation of Nanostructural Materials Induced by Mechanical Processing显示文摘 | Garret E Abdellaoui M Malhouroux-Gaffet N | 1995 | Mater Trans1995，36，2： | 1 |
| 5 | Detection of Mycoplasma pneumoniae by using the polymerase chain reaction显示文摘 | Garret M de Barbeyrac B | 1989 | J Clin Microbiol1989，27，11： | 1 |
| 6 | Predicted optimum composition for the glass-forming ability of bulk amorphous alloys: Application to Cu-Zr-AI 显示文摘 | AN Q SAMWER K GODDARD W A JOHNSON W L JARAMILLO-BOTERO A GARRET G DEMETRIOU M D | 2012 | Journal of Physical Chemistry Letters2012，3，： | 1 |
| 7 | Building the northern Tien Shah: Integrated thermal, structural, and topographic constraints 显示文摘 | Bullen M E Burbank D W Garret J I | 2003 | J Geol2003，111，2： | 1 |
| 8 | Taurine in marine invertebrates显示文摘 | ALLA J A GARRET M R | 1971 | Advances in Marine Biology1971，，9： | 1 |
| 9 | Detection of Mycoplasma pneumoniae by using the polymerase chain reaction显示文摘 | Bernet C Garret M de Barbeyrac B | 1989 | J Clin Microbiol1989，27，11： | 1 |
| 10 | Detection of Mycoplas- ma neumoniae by using the polymerase chain reaction 显示文摘 | Bernel C Garret M Bertille de B | 1989 | Clin Microbiol1989，27，11： | 1 |
| 11 | A phase I study of ethyl acetate extract of the Chinese antirheumatic herb Tripterygium wilfordii Hook F in rheumatoid arthritis 显示文摘 | Tao X L Cush J J Garret M | 2001 | d Rheumatol2001，28，10： | 1 |
| 12 | Detection of myco- plasma pneumoniae by using the polymerase chain reaction显示文摘 | Bernet C Garret M de Barbeyrac B | 1989 | J Clin Microbiol1989，27，4： | 1 |
| 13 | Light rail: Boon or Boondoggle? 显示文摘 | Castelazo M Garret T | 2004 | The Regional Economist2004，，： | 1 |
| 14 | 查看详情显示文摘 | Akane Suzuki Garret DeNolf C Tresa Pollock M | | 0，，05： | 1 |
| 15 | Detection of Myeoplasma pneumoniae by using the polymerase chain reaction 显示文摘 | Bemet C Garret M de Barbeyrac B | 1989 | Journal of clinical microbiology1989，27，11： | 1 |
| 16 | Job satisfaction of university aca- demics: perspectives from Uganda 显示文摘 | SSESANGA K GARRETE R M | 2005 | Higher Education2005，50，1： | 1 |
| 17 | Selective inhibitors of cyclooxygenase-2显示文摘 | Issam A M Garret A F | 2001 | Mol Interventions2001，1，： | 1 |
| 18 | R-factor,free R,and complete cross-validation for dipolar coupling refinement of NMR structures显示文摘 | Clore G M Garret D S | 1999 | J Am Chem Soc1999，121，： | 1 |
| 19 | Inventory competition under dynamic consumer choice 显示文摘 | Siddharth M Garret V R | 2001 | Operations Research2001，49，5： | 1 |
| 20 | Inventory competition under dynamic consumer choice显示文摘 | Siddharth M Garret V R | 2001 | Operations Research2001，49，5： | 1 |
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