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dc.contributor.authorSmith, Paul E
dc.contributor.authorWaters, Sinead M
dc.contributor.authorKenny, David A
dc.contributor.authorKirwan, Stuart F
dc.contributor.authorConroy, Stephen
dc.contributor.authorKelly, Alan K
dc.date.accessioned2023-01-16T13:03:42Z
dc.date.available2023-01-16T13:03:42Z
dc.date.issued2021-10-01
dc.identifier.citationPaul E Smith, Sinead M Waters, David A Kenny, Stuart F Kirwan, Stephen Conroy, Alan K Kelly, Effect of divergence in residual methane emissions on feed intake and efficiency, growth and carcass performance, and indices of rumen fermentation and methane emissions in finishing beef cattle, Journal of Animal Science, Volume 99, Issue 11, November 2021, skab275, https://doi.org/10.1093/jas/skab275en_US
dc.identifier.urihttp://hdl.handle.net/11019/2888
dc.descriptionpeer-revieweden_US
dc.description.abstractResidual expressions of enteric emissions favor a more equitable identification of an animal’s methanogenic potential compared with traditional measures of enteric emissions. The objective of this study was to investigate the effect of divergently ranking beef cattle for residual methane emissions (RME) on animal productivity, enteric emissions, and rumen fermentation. Dry matter intake (DMI), growth, feed efficiency, carcass output, and enteric emissions (GreenFeed emissions monitoring system) were recorded on 294 crossbred beef cattle (steers = 135 and heifers = 159; mean age 441 d (SD = 49); initial body weight (BW) of 476 kg (SD = 67)) at the Irish national beef cattle performance test center. Animals were offered a total mixed ration (77% concentrate and 23% forage; 12.6 MJ ME/kg of DM and 12% CP) ad libitum with emissions estimated for 21 d over a mean feed intake measurement period of 91 d. Animals had a mean daily methane emissions (DME) of 229.18 g/d (SD = 45.96), methane yield (MY) of 22.07 g/kg of DMI (SD = 4.06), methane intensity (MI) 0.70 g/kg of carcass weight (SD = 0.15), and RME 0.00 g/d (SD = 0.34). RME was computed as the residuals from a multiple regression model regressing DME on DMI and BW (R2 = 0.45). Animals were ranked into three groups namely high RME (>0.5 SD above the mean), medium RME (±0.5 SD above/below the mean), and low RME (>0.5 SD below the mean). Low RME animals produced 17.6% and 30.4% less (P < 0.05) DME compared with medium and high RME animals, respectively. A ~30% reduction in MY and MI was detected in low versus high RME animals. Positive correlations were apparent among all methane traits with RME most highly associated with (r = 0.86) DME. MY and MI were correlated (P < 0.05) with DMI, growth, feed efficiency, and carcass output. High RME had lower (P < 0.05) ruminal propionate compared with low RME animals and increased (P < 0.05) butyrate compared with medium and low RME animals. Propionate was negatively associated (P < 0.05) with all methane traits. Greater acetate:propionate ratio was associated with higher RME (r = 0.18; P < 0.05). Under the ad libitum feeding regime deployed here, RME was the best predictor of DME and only methane trait independent of animal productivity. Ranking animals on RME presents the opportunity to exploit interanimal variation in enteric emissions as well as providing a more equitable index of the methanogenic potential of an animal on which to investigate the underlying biological regulatory mechanisms.en_US
dc.description.sponsorshipFACCE ERA-GAS
dc.language.isoenen_US
dc.publisherOxford University Pressen_US
dc.relation.ispartofseriesJournal of Animal Science;Vol 99
dc.rightsAttribution-NonCommercial-ShareAlike 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/4.0/*
dc.subjectBeef cattleen_US
dc.subjectresidual methane emissionsen_US
dc.titleEffect of divergence in residual methane emissions on feed intake and efficiency, growth and carcass performance, and indices of rumen fermentation and methane emissions in finishing beef cattleen_US
dc.typeArticleen_US
dc.identifier.doihttps://doi.org/10.1093/jas/skab275
dc.contributor.sponsorFACCE ERA-GASen_US
dc.contributor.sponsorEuropean Unionen_US
dc.contributor.sponsorTeagasc Walsh Scholarship Programmeen_US
dc.contributor.sponsorGrantNumber16/RD/ERAGAS/1RUMENPREDICT-ROI2017en_US
dc.contributor.sponsorGrantNumber818368en_US
dc.contributor.sponsorGrantNumberRMIS 0364en_US
dc.source.volume99
dc.source.issue11
dc.source.journaltitleJournal of Animal Science


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