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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 | Effects of cinnamaldehyde, garlic and juniper berry essential oils on rumen fermentation, blood metabolites, growth performance, and carcass characteristics of growing lambs显示文摘 | Chaves A V Stanford K Dugan M E R eL al | 2008 | Livestock Science2008，117，23： | 1 |
| 3 | Alterations in car- bon and nitrogen metabolism induced by water deficit in the stems and leaves of Lupinus albus L显示文摘 | PINHEIRO C CHAVES M M RICARDO C P | 2001 | Journal of Experimental Botany2001，52，： | 1 |
| 4 | Photosynthesis underdrought and salt stress:Regulation mechanisms from whole plant to cell 显示文摘 | CHAVES M M FLEXAS J PINHEIRO C | 2009 | Annals of Botany2009，103，： | 1 |
| 5 | Tree allometry and improved estimation of carbon stocks and balance in tropical forests显示文摘 | Chave J Andalo C Brown S Cairns M A Chambers J Q Eamus D Folster H Fromard F Higuchi N Kira T Lescure J P Nelson B W Ogawa H Puig H Riera B Yamakura T | | 0，，： | 1 |
| 6 | Estimation of biomass in aneotropical forest of French Guiana:spatial and temporal variability显示文摘 | Chave J Riéra B Dubois M A | 2001 | Journal ofTropical Ecology2001，17，： | 1 |
| 7 | How plants cope with water stress in the field? Photosynthesis and growth显示文摘 | Chaves M M Pereira J S Maroco J | 2002 | Annals of Botany2002，89，7： | 1 |
| 8 | On the robust estimation of power spectra, coherences, and transfer functions显示文摘 | Chave A D Thomson D J Ander M E | 1987 | Journal of Geophysical Research1987，92，1： | 1 |
| 9 | Co-xsackie virus A24 infection presenting asacute flaccid paralysis 显示文摘 | Chaves SS Lobo S Kennelt M | 2001 | Lancet2001，357，9256： | 1 |
| 10 | Association rule-based feature selection method for Alzheimer's dis- ease diagnosis显示文摘 | Chaves R Ramirez J G6rriz J M | 2012 | Expert Systems with Applications2012，39，11： | 1 |
| 11 | Fatigue resistance of engine-driven rotary nickeltitanium endodontic instruments显示文摘 | Chaves Craveiro de Melo M Guiomar de Azevedo Bahia M Lopes Buono VT | 2002 | J Endod2002，28，11： | 1 |
| 12 | Coxsackie virus A24 infection presenting as acute flaccid paralysis 显示文摘 | Chaves SS Lobo S Kennett M | 2001 | Lancet2001，357，9256： | 1 |
| 13 | Drought tolerance in relation to protection against oxidative stress in clones of Coffea canephora subjected to long-term drought显示文摘 | Pinheiro H A DaMatta F M Chaves A R M | 2004 | Plant Science2004，167，6： | 1 |
| 14 | Understanding plant responses to drought-from genes to the whole plant显示文摘 | Chaves M M Maroco J P Pereira J S | 2003 | Functional Plant Biology2003，30，3： | 1 |
| 15 | Prevention of vaficella : recommendations of the Advisory Committee on Immunization Practices (ACIP)显示文摘 | Matin M Guris D Chaves SS etc | 2007 | MMWR Recomm Rep2007，56，4： | 1 |
| 16 | Electromagnetic Induction by a Finite Electric Dipole Source Over a 2-D Earth显示文摘 | Unsworth M J Travis B J Chave A D | 1993 | Geophysics1993，58，1： | 1 |
| 17 | Drought tolerance in relation to protection against oxidat'ive stress inclones of Cojfea canephora subjected to long-term drought 显示文摘 | PINHEIRO H A DAMATTA F M CHAVES ARM | 2004 | Plant Science2004，167，： | 1 |
| 18 | Molecular characterization of resistance to mupirocin in methicillin-resistant Staphylococcus aureus isolates in a tertiary hospital in Spain显示文摘 | Daskalaki M Otero JR Chaves F | | 0，，04： | 1 |
| 19 | Toxic epidemml neerolysis: current evidence, practical management and future directions 显示文摘 | Chave TA Moriimer NJ Sladden M J | 2005 | Br J Dermatol2005，153，2： | 1 |
| 20 | (Pre)diabetes, brain aging, and cognition显示文摘 | S Roriz-Filho J S-Roriz TM Rosset I Camozzato AL Santos AC Chaves ML Moriguti JC Roriz-Cruz M | 2009 | Biochim Biophys Acta2009，1792，5： | 1 |
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