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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 | Total and partial electron collisional ionization cross sections for Ch4,C2H6,SiH4 and Si2H6 显示文摘 | Chatham H Hils D Robertson R et aI | 1984 | J Chem Phys1984，81，： | 1 |
| 3 | SANEX-BTP process development studies显示文摘 | Hil C Guilaneux D Berthon L | | 0，，1： | 1 |
| 4 | History and Integrity of Thoroughbred Dam Lines Revealed in Equine mtDNA Variation显示文摘 | Hil E W Bradley D G Al-Barody M | 2002 | Animal Genetics2002，33，4： | 1 |
| 5 | Intramedul ary,antibiotic-loaded cemented,massive al ografts for skeletal reconstruction:26 cases compared with 19 uncemented al ografts显示文摘 | Ozaki T Hil mann A Bettin D | | 0，，： | 1 |
| 6 | The measurement of migration of the acetabular component of hip prostheses显示文摘 | Nunn D Freeman MAR Hil PF | | 0，，04： | 1 |
| 7 | Stem cel s for myocardial regeneration显示文摘 | Orlic D Hil JM Arai AE | | 0，，12： | 1 |
| 8 | Tumor cellplastici-ty in Ewing sarcoma,an alternative circulatory system stimulated by hypoxia显示文摘 | Van Der Schaft D W Hil en F Pauwels P | | 0，，24： | 1 |
| 9 | Unconventional shale-gas systems: the Mississippian Barnett Shale of north-central Texas as one model for thermogenic shale-gas assessment 显示文摘 | Jarvie D M Hil R J Rubi E T E | 2007 | AAPG Bulletin2007，91，4： | 1 |
| 10 | Juvenile idiopathic inflammatory myopathies:the value of magnetic resonance imaging in the detection of muscle involvement显示文摘 | Hilário MO Yamashita H Lutti D | 2000 | Sao Paulo Med J2000，118，2： | 1 |
| 11 | Differentiation of deceptionusing pupil ary responses as an index of cognitive processing显示文摘 | Dionisio D P Granholm E Hil ix W A Perrine W F | | 0，，02： | 1 |
| 12 | Visual Languages and Computing Survey:Data Flow Visual Programming Languages显示文摘 | Hils D D | 1992 | Journal of Visual Languages and Computing1992，，3： | 1 |
| 13 | Voxel similarity measures for 3 - D serial MR brain image registration显示文摘 | MARH K HIL D L G DENTON E R E | 2000 | IEEE Transactions on Image Processing2000，19，2： | 1 |
| 14 | Keratoprosthesis surgery显示文摘 | Liu C Hil e K Tan D | | 0，，： | 1 |
| 15 | The effect of comorbidity on the use of adjuvant chemotherapy and survival from colon cancer:a ret rospective cohort study显示文摘 | Sarfati D Hil S Blakely T | | 0，，09： | 1 |
| 16 | Modem thir- ty-day operative mortality for surgical resections in Lung cancer显示文摘 | GINSBERGRJ HIL L D EAGAN R T | 1983 | J Thorac Cardiovasc Surg1983，86，5： | 1 |
| 17 | Protein kinase C pathway显示文摘 | Brandt D Gimona M Hil mann M | | 0，，23： | 1 |
| 18 | Anostracan cysts found in California salt lakes 显示文摘 | Shepard W D Hil R E | 2001 | Hydrobiologia2001，466，： | 1 |
| 19 | In vivo degradation of 14C-labeled smal intestinal submucosa(SIS)when used for urinary bladder repair显示文摘 | Record RD Hil egonds D Simmons C | | 0，，19： | 1 |
| 20 | Pesticide use and breast cancer risk among farmers'wives in the agricultural health study显示文摘 | Engel L S Hil D A Hoppin J A | 2005 | American Journal of Epidemiology2005，161，2： | 1 |
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