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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 | Psychological complications in 281 plastic surgery practices显示文摘 | Borah G Rankin M Wey P | 1999 | Plast Reconstr Sarg1999，104，5： | 1 |
| 3 | Psychological complications in 281plastic surgery practices 显示文摘 | Borah G Rankin M Wey P | 1999 | Plast Reconstr Sarg1999，104，5： | 1 |
| 4 | Psychological complications in 281 plastic surgery practices 显示文摘 | Borah G Rankin M Wey P | 1999 | Plast Reconstr Sarg1999，104，： | 1 |
| 5 | Wavelet transform based image texture analysis for size estimation applied to the sorting of tea granules 显示文摘 | BORAH S HINES E L BHUYAN M | 2007 | Journal of Food Engineering2007，79，2： | 1 |
| 6 | An edge-based heuristic for steiner routing显示文摘 | M Borah R M Owens M J Irwin | 1994 | IEEE Trans Computer-Aided Des1994，13，： | 1 |
| 7 | Distribution and Nature of Organic and Mineral Bound Elements in Assan Coals 显示文摘 | Baruah M K Kotoky P Borah G C | 2003 | Fuel2003，82，9： | 1 |
| 8 | Watershed--scale hydrologic and nonpoint-source pollution models: review of mathematical bases显示文摘 | Bera M Borah D K | 2003 | Transactions of the American Society of Agricultural Engineers2003，46，6： | 1 |
| 9 | Watershed-scale hydrologic and non- point-source pollution models: Review of applications显示文摘 | Borah D K Beta M | 2004 | Transactions of the ASAE2004，47，3： | 1 |
| 10 | Non-destructive testing of tea fermentation using image processing显示文摘 | Borah M Bhuyan M | 2003 | Insight-Non- Destructive Testing and Condition Monitoring2003，45，1： | 1 |
| 11 | Psychological complications:national plastic surgical nursing survey显示文摘 | Rankin M Borah G | 2009 | Plast Surg Nurs2009，29，1： | 1 |
| 12 | 显示文摘 | Thakuria H Borah B M Das G | 2007 | J Mol Catal A-Chem2007，274，： | 1 |
| 13 | An edge-based heuristic for Steiner routing 显示文摘 | Borah M Owens R M Irwin M J | 1994 | IEEE Transactions on Computer Aided Design of Integrated Circuits and Systems1994，13，12： | 1 |
| 14 | Oxidation of highsulphur coal Part 2 Desulphurization of organic sulphurby hydrogen peroxide in presence of metalions 显示文摘 | D Borah M K Baruah I Haque | 2001 | Fuel2001，，80： | 1 |
| 15 | A computer based system for matching colours during the monitoring of tea fermentation 显示文摘 | Borah S Bhuyan M | 2005 | International Journal of Food Science and Technology2005，40，6： | 1 |
| 16 | Psychological complications:national plasticsurgical nursing survey显示文摘 | Rankin M Borah G | 2009 | Plast Surg Nurs2009，29，1： | 1 |
| 17 | Psychological Complications in 281 Plastic Surgery Practices显示文摘 | Borah G Rankin M Wey P | 1999 | Plastic Reconstr Sarg1999，，104： | 1 |
| 18 | Psychological Complications in 281 Plastic Surgery Practices显示文摘 | RANKIN M WEY P | 1999 | Plast Reconstr Surg(S0301-620X)1999，104，： | 1 |
| 19 | , Effect of substrate temperature on structural properties of thermally evaporated ZnSe thin films 显示文摘 | SUMBIT CHALIHA M N BORAH P C SARMAH | 2008 | JOURNAL OF OPTOELECTRONICS AND ADVANCED MATERIALS2008，10，2： | 1 |
| 20 | Distribution and nature of organic and mineral bound elements in assan coals显示文摘 | Baruah M K Kotoky P Borah G C | 2003 | Fuel2003，82，： | 1 |
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