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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 | Energetic-protein supplementation in the last 60 days of gestation improves performance of beef cows grazing tropical pastures显示文摘Background: Nutrition is one of the most important factors that affect animal performance, and it therefore also impacts on financial results in beef systems. In this way, finding the best strategy for feeding supplements is of paramount importance. Aiming to evaluate the effect of supplement feeding strategies for beef cows in the last third of gestation, two experiments were conducted. In Experiment 1, 35 pregnant Nellore cows were assigned to a completely randomized design with four treatments: control, which received no supplement; supplementation for the last 30 d of gestation(30-d; 3.0 kg/d); supplementation for the last 60 d of gestation(60-d; 1.5 kg/d); or supplementation for the last 90 d of gestation(90-d; 1.0 kg/d). All supplemented treatments received the same total amount of supplement throughout the experiment: 90 kg(20% of crude protein). A second experiment(Experiment 2) was delineated to evaluate the effects of the amounts offered in Experiment 1 on intake and metabolism. Four multiparous pregnant Nellore cows were assigned to a 4 × 4 Latin square design, with periods of15 d each.Results: There was a linear effect of the number of days of supplementation on calving body weight(BW; P < 0.05)and a quadratic effect on BW change from parturition to d 31 post-calving(P < 0.05), with cows on the 60-d strategy losing less BW post-calving. No difference was found in offspring birth BW(P > 0.10). A significant linear effect on interval from parturition to conception(P < 0.05) was observed, with the highest calving to conception interval being observed in the 90-d strategy. The level of supplementation did not affect forage intake or neutral detergent fiber digestibility(P > 0.10). Nitrogen excreted through urine tended to increase linearly with the level of supplementation(P < 0.10).Conclusion: Providing 1.5 kg of supplement during the last 60 d of gestation improves cow performance after calving, reducing the magnitude of BW lost, and reduces the number of days from calving to re-conception in the following breeding season compared to the usually recommended period of supplementation of 90 d pre-partum. | Aline Gomes da Silva Mário Fonseca Paulino Edenio Detmann Henrique Jorge Fernandes Lincoln da Silva Amorim Román Enrique Maza Ortega Victor Valério de Carvalho Josilaine Aparecida da Costa Lima Felipe Henrique de Moura Mariana Benevides Monteiro Jéssika Almeida Bitencourt | 2018 | Journal of Animal Science and Biotechnology2018，9，1： | 2 |
| 3 | Effects of saccharomyces cerevisiae and mouensin on digestion,ruminal parameters,and balance of nitrogenous compounds of beef cattle fed diets with different starch concentrations 显示文摘 | Monnerat J P Paulino p V Detmann E | 2013 | Trop Anim Health Prod2013，45，5： | 1 |
| 4 | Replacement soybean meal by treated castor meal in supplements for gra ing heifer during the dry-rainy season period显示文摘 | Barros L V Paulino M F Detmann E | | 0，，： | 1 |
| 5 | Levels of sup-plementation for grazing beef heifers 显示文摘 | Cabral C H A Paulino M F Detmann E | 2014 | Asian-AustralasianJournal of Animal Sciences’2014，27，6： | 1 |
| 6 | In vitro degradation of neutral detergent fiber of low-quality tropical forage accordingto supplementation with true protein and (or) non-protein nitrogen显示文摘 | Detmann E Queiroz A C Zorzi K et 01 | 2011 | Rev Bras Zoo2011，40，6： | 1 |
| 7 | Silicon nutrition increases grain yield,which,in turn,exerts a feed-forward stimulation of photosynthetic rates via enhanced mesophyll conductance and alters primary metabolism in rice显示文摘 | DETMANN KC ARAUJO WL MARTINS SCV | 2012 | New Phytologist2012，196，3： | 1 |
| 8 | Supplementation ofsuckling beef calves with different levels of crude protein ontropica] pasture显示文摘 | Lopes S A Paulino M F Detmann E | 2014 | Tropical Animal Health and Production2014，46，2： | 1 |
| 9 | Effect of calves' supplementation on performance, nutritional and be- havioral characteristics of their dams 显示文摘 | Valente E E L Paulino M Detmann E | 2013 | Tropical Animal Health and Production2013，45，2： | 1 |
| 10 | Intake and digestibility in cattle fed low-quality tropical forage and supplemented with nitrogenous compounds显示文摘 | Sampaio C B Detmann E Paulino M F | 2010 | Trop Anim Health Pro2010，42，7： | 1 |
| 11 | Simulation and validation of digestive kinetic parameters using an in vitro gas production system in crossbred steers with pasture supplementation显示文摘 | Detmann E Paulino M F Cabral L S et ol | 2005 | Braz J Anita Sci2005，34，： | 1 |
| 12 | Validation of predictive equations for neutral detergent fiber indigestible fraction in tropical grasses 显示文摘 | Detmann E Zervoudakis J T Cabral L S et ol | 2004 | Braz J Anim Sci2004，33，： | 1 |
| 13 | Evaluation of lignin contents in tropical forages using differentanalytical methods and their correlations with degradation ofinsoluble fiber显示文摘 | Gomes D I Detmann E Valadares Filho S D C | 2011 | Anim Feed Sci Tech2011，168，3： | 1 |
| 14 | Evaluation of indirect methods to estimate the nutritional value of tropical feeds for ruminants 显示文摘 | Magalh a es K A Valadares Filho S C Detmann E | 2010 | Anim Feed Sci Tech2010，155，： | 1 |
| 15 | Silicon nutrition increases grain yield,which,in turn,exerts a feedforward stimulation of photosynthetic rates via enhanced mesophyll conductance and alters primary metabolism in rice显示文摘 | Detmann K C Araújo W L Martins S C V | 2012 | New Phytologist2012，196，3： | 1 |
| 16 | Nutritional evaluation,during the nursing phase,of grazing young bulls that received supplementation with different protein profiles from nursing to finishing显示文摘 | Fernandes H J Paulino M F Detmann E | 2012 | Revista Brasileira de Zootecnia2012，41，2： | 1 |
| 17 | Strategies of supplementation of female suckling calves and nutrition parameters of beef cows on tropical pasture显示文摘 | Valente E E L Paulino M F Detmann E | 2012 | Tropical Animal Health and Production2012，44，18： | 1 |
| 18 | Effects of Saccharomyces cerevisiae and monensin on diges- tion, ruminal parameters, and balance of nitrogenous com- pounds of beef cattle fed diets with different starch concentra- tions 显示文摘 | Monnerat J P I dos S Paulino P V R Detmann E | 2013 | Tropical Animal Health and Production2013，45，5： | 1 |
| 19 | Pre-diction of the energy value of cattle diets based on thechemical composition of the feeds under tropical con-ditions 显示文摘 | DETMANN E FILHO S C V PINA D S | 2008 | Animal Feed Science and Technology2008，143，1234： | 1 |
| 20 | Silicon nutri- tion increases grain yield, which, in turn, exerts deed-forward stimulation of photosynthetic rates via enhancedmesophyll con- ductance and alters primary metabolism in rice显示文摘 | Detmann K C Arafijo W L Martins S C V | 2012 | New Phytolo- gist2012，196，3： | 1 |
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