Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/61374
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dc.contributor.authorHerd, R Men
dc.contributor.authorOddy, V Hen
dc.contributor.authorArthur, P Fen
dc.contributor.authorMcDonagh, M Ben
dc.date.accessioned2024-07-10T01:00:16Z-
dc.date.available2024-07-10T01:00:16Z-
dc.date.issued2024-06-18-
dc.identifier.citationAnimal Production Science, 64(9), p. 1-11en
dc.identifier.issn1836-5787en
dc.identifier.issn1836-0939en
dc.identifier.urihttps://hdl.handle.net/1959.11/61374-
dc.description.abstract<p><b>Context.</b> Selection for growth rate has received considerable attention in beef cattle but the evidence for an improvement in the efficiency of feed conversion is equivocal. <b>Aim.</b> To examine whether feed efficiency by beef cattle finished in a feedlot had been changed in response to divergence selection for growth rate. <b>Methods.</b> The Angus cattle used came from three lines of cattle selected for over five generations for fast growth rate to yearling age (High-line), slow growth (Low-line), or from an unselected Control-line. Over sequential years, a cohort of steers, then of heifers and then of steers, representative of the lines, were measured for feedlot performance, and carcase- and meat-quality traits. The animals were fed a high-energy feedlot ration and after an adjustment period they underwent a performance test of at least 70 days of duration. After slaughter, muscle samples were taken for subsequent measurement of the components of the endogenous calpain proteolytic enzyme system. Their carcasses underwent a standard chiller assessment and meat samples were taken after 1 day and 14 days (steers) or 17 days (heifers) for objective measurement of tenderness. <b>Key results.</b> Cattle from the High-line grew 48% faster (<i>P</i> < 0.05), and ate 48% more feed (<i>P</i> < 0.05) than did those from the Low-line, but had similar (<i>P</i> > 0.05) feed conversion ratio and residual feed intake. There were no differences between the High-line and Low-line in the visual meat-quality attributes of meat colour, fat colour and marbling, and no differences in the objective measurements of tenderness and connective-tissue toughness. There was no evidence of a selection response in the circulating concentrations of the metabolites and hormones measured, nor in the endogenous calpain proteolytic enzyme system in muscle. <b>Conclusions.</b> The superior growth demonstrated by the High-line cattle over the feedlot test was accompanied by a higher feed intake, with no evidence for an improvement in feed efficiency. <b>Implications.</b> Selection for growth rate is a powerful tool to alter animal performance but the beef industry needs to be cognisant of the proportional increase in feed requirement from breeding bigger animals.</p>en
dc.languageenen
dc.publisherCSIRO Publishingen
dc.relation.ispartofAnimal Production Scienceen
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.titleSelection for growth rate at pasture in Angus cattle results in heavier cattle that eat more in the feedloten
dc.typeJournal Articleen
dc.identifier.doi10.1071/AN24084en
dcterms.accessRightsUNE Greenen
local.contributor.firstnameR Men
local.contributor.firstnameV Hen
local.contributor.firstnameP Fen
local.contributor.firstnameM Ben
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.emailrherd3@une.edu.auen
local.profile.emailhoddy2@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.publisher.placeAustraliaen
local.identifier.runningnumberAN24084en
local.format.startpage1en
local.format.endpage11en
local.peerreviewedYesen
local.identifier.volume64en
local.identifier.issue9en
local.access.fulltextYesen
local.contributor.lastnameHerden
local.contributor.lastnameOddyen
local.contributor.lastnameArthuren
local.contributor.lastnameMcDonaghen
dc.identifier.staffune-id:rherd3en
dc.identifier.staffune-id:hoddy2en
local.profile.orcid0000-0003-4689-5519en
local.profile.orcid0000-0003-1783-1049en
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:1959.11/61374en
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
local.title.maintitleSelection for growth rate at pasture in Angus cattle results in heavier cattle that eat more in the feedloten
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.search.authorHerd, R Men
local.search.authorOddy, V Hen
local.search.authorArthur, P Fen
local.search.authorMcDonagh, M Ben
local.open.fileurlhttps://rune.une.edu.au/web/retrieve/8a624bd3-14e7-461b-84e1-a20d832c0ee8en
local.uneassociationYesen
local.atsiresearchNoen
local.sensitive.culturalNoen
local.year.published2024en
local.fileurl.openhttps://rune.une.edu.au/web/retrieve/8a624bd3-14e7-461b-84e1-a20d832c0ee8en
local.fileurl.openpublishedhttps://rune.une.edu.au/web/retrieve/8a624bd3-14e7-461b-84e1-a20d832c0ee8en
local.subject.for2020300301en
local.codeupdate.date2024-08-02T15:30:24.623en
local.codeupdate.epersonrherd3@une.edu.auen
local.codeupdate.finalisedtrueen
local.original.for20203003 Animal productionen
local.profile.affiliationtypeUNE Affiliationen
local.profile.affiliationtypeUNE Affiliationen
local.profile.affiliationtypeExternal Affiliationen
local.profile.affiliationtypeExternal Affiliationen
local.date.moved2024-07-24en
Appears in Collections:Journal Article
School of Environmental and Rural Science
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