Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/20932
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dc.contributor.authorVelazco, J Ien
dc.contributor.authorHerd, Robert Men
dc.contributor.authorCottle, Daviden
dc.contributor.authorHegarty, Rogeren
dc.date.accessioned2017-05-18T10:05:00Z-
dc.date.issued2017-
dc.identifier.citationAnimal Production Science, 57(4), p. 627-635en
dc.identifier.issn1836-5787en
dc.identifier.issn1836-0939en
dc.identifier.urihttps://hdl.handle.net/1959.11/20932-
dc.description.abstractAs daily methane production (DMP; g CH₄/day) is strongly correlated with dry matter intake (DMI), the breeding of cattle that require less feed to achieve a desired rate of average daily gain (ADG) by selection for a low residual feed intake (RFI) can be expected to reduce DMP and also emission intensity (EI; g CH₄/kg ADG). An experiment was conducted to compare DMP and EI of Angus cattle genetically divergent for RFI and 400-day weight (400dWT). In a 6-week grazing study, 64 yearling-age cattle (30 steers, 34 heifers) were grazed on temperate pastures, with heifers and steers grazing separate paddocks. Liveweight (LW) was monitored weekly and DMP of individual cattle was measured by a GreenFeed emission monitoring unit in each paddock. Thirty-nine of the possible 64 animals had emission data recorded for 15 or more days, and only data for these animals were analysed. For these cattle, regression against their mid-parent estimated breeding value (EBV) for post-weaning RFI (RFI-EBV) showed that a lower RFI-EBV was associated with higher LW at the start of experiment. Predicted dry matter intake (pDMI), predicted DMP (pDMP) and measured DMP (mDMP) were all negatively correlated with RFI-EBV (P < 0.05), whereas ADG, EI, predicted CH₄ yield (pMY; g CH₄/kg DMI) were not correlated with RFI-EBV (P > 0.1). Daily CH₄ production was positively correlated with animal LW and ADG (P < 0.05). The associations between ADG and its dependent traits EI and pMY and predicted feed conversion ratio (kg pDMI/kg ADG) were strongly negative (r = -0.82, -0.57 and -0.85, P < 0.001) implying that faster daily growth by cattle was accompanied by lower EI, MY and feed conversion ratio. These results show that cattle genetically divergent for RFI do not necessarily differ in ADG, EI or pMY on pasture and that, if heavier, cattle with lower RFI-EBV can actually have higher DMP while grazing moderate quality pastures.en
dc.languageenen
dc.publisherCSIRO Publishingen
dc.relation.ispartofAnimal Production Scienceen
dc.titleDaily methane emissions and emission intensity of grazing beef cattle genetically divergent for residual feed intakeen
dc.typeJournal Articleen
dc.identifier.doi10.1071/an15111en
dc.subject.keywordsAnimal Nutritionen
local.contributor.firstnameJ Ien
local.contributor.firstnameRobert Men
local.contributor.firstnameDaviden
local.contributor.firstnameRogeren
local.subject.for2008070204 Animal Nutritionen
local.subject.seo2008960302 Climate Change Mitigation Strategiesen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.emailrherd3@une.edu.auen
local.profile.emaildcottle2@une.edu.auen
local.profile.emailrhegart3@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune-20161114-143840en
local.publisher.placeAustraliaen
local.format.startpage627en
local.format.endpage635en
local.identifier.scopusid85014548617en
local.peerreviewedYesen
local.identifier.volume57en
local.identifier.issue4en
local.contributor.lastnameVelazcoen
local.contributor.lastnameHerden
local.contributor.lastnameCottleen
local.contributor.lastnameHegartyen
dc.identifier.staffune-id:rherd3en
dc.identifier.staffune-id:dcottle2en
dc.identifier.staffune-id:rhegart3en
local.profile.orcid0000-0003-4689-5519en
local.profile.orcid0000-0003-3875-3465en
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:21125en
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
local.title.maintitleDaily methane emissions and emission intensity of grazing beef cattle genetically divergent for residual feed intakeen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.search.authorVelazco, J Ien
local.search.authorHerd, Robert Men
local.search.authorCottle, Daviden
local.search.authorHegarty, Rogeren
local.uneassociationUnknownen
local.year.published2017en
local.fileurl.closedpublishedhttps://rune.une.edu.au/web/retrieve/5331d670-fcf8-4c9e-a4ce-5d6e67d6fc1den
local.subject.for2020300303 Animal nutritionen
local.subject.seo2020190301 Climate change mitigation strategiesen
Appears in Collections:Journal Article
School of Environmental and Rural Science
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