Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/2778
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dc.contributor.authorHegarty, R Sen
dc.contributor.authorMcFarlane, J Ren
dc.contributor.authorBanks, Ren
dc.contributor.authorHarden, Sen
dc.date.accessioned2009-10-29T16:59:00Z-
dc.date.issued2006-
dc.identifier.citationAustralian Journal of Agricultural Research, 57(6), p. 683-690en
dc.identifier.issn1444-9838en
dc.identifier.issn0004-9409en
dc.identifier.issn1836-5795en
dc.identifier.issn1836-0947en
dc.identifier.urihttps://hdl.handle.net/1959.11/2778-
dc.description.abstractAn experiment was conducted to test 3 hypotheses regarding the variation in plasma parameters and their association with lamb growth and composition. The experiment tested whether sire genetics and available nutrition affected specific plasma traits, whether these traits were associated with growth and compositional characteristics, and whether data on plasma traits could improve the prediction of growth and carcass composition. Lambs (n = 103) produced by sires differing in estimated breeding values for growth, muscling, and fat were reared on LOW or HIGH planes of lifetime nutrition. Blood samples were collected immediately prior to weaning and before slaughter at 8 months of age. Concentrations of plasma creatinine (CRE), urea (PUN), insulin like growth factor I (IGF-I) were measured in all samples. Leptin was measured in samples from male lambs only (n = 56). HIGH nutrition increased preweaning and preslaughter IGF-I and leptin concentrations; nutritional effects on PUN and CRE were inconsistent. Lambs of the high muscle sire-type exhibited increased plasma IGF-I, reduced PUN, and an increased PUN : CRE ratio preweaning. Increased genetic potential of the sire for growth reduced PUN and increased PUN : CRE ratio. Plasma IGF-I correlated strongly with lamb growth rate (r² = 0.49). Interaction of nutrition and sire-type for preslaughter leptin mimicked the interaction occurring for carcass fat, providing an example of selection on genotype inducing a physiological (hormonal) change and resulting in a modified phenotype. Stepwise regressions developed to predict carcass protein and fat mass from information available at weaning or at slaughter indicated that inclusion of plasma parameters in these models caused only small increases in the proportion of variance accounted for. The most significant benefit was an increase in the proportion of variance in carcass weight accounted for (from 65 to 73%) by including IGF-I and CRE as predictors compared with prediction from weaning weight alone. If slaughter data were available, then >90% of the variance in carcass fat and protein masses was explained by carcass weight alone and this was not increased by inclusion of any preslaughter plasma parameter in the model. It was concluded that while nutrition and the genetic capacity of the sire (especially for muscling) affect plasma constituents as well as lamb growth and carcass composition, the inclusion of the measured plasma traits in models to predict final carcass composition from weaning data or slaughter data is unlikely to improve the prediction sufficient to justify the additional measurement cost.en
dc.languageenen
dc.publisherCSIRO Publishingen
dc.relation.ispartofAustralian Journal of Agricultural Researchen
dc.titleAssociation of plasma metabolites and hormones with the growth and composition of lambs as affected by nutrition and sire geneticsen
dc.typeJournal Articleen
dc.identifier.doi10.1071/AR05260en
dc.subject.keywordsAnimal Nutritionen
local.contributor.firstnameR Sen
local.contributor.firstnameJ Ren
local.contributor.firstnameRen
local.contributor.firstnameSen
local.subject.for2008070204 Animal Nutritionen
local.subject.seo2008970106 Expanding Knowledge in the Biological Sciencesen
local.profile.schoolSchool of Science and Technologyen
local.profile.emailjmcfarla@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordpes:3245en
local.publisher.placeAustraliaen
local.format.startpage683en
local.format.endpage690en
local.identifier.scopusid33745256762en
local.peerreviewedYesen
local.identifier.volume57en
local.identifier.issue6en
local.contributor.lastnameHegartyen
local.contributor.lastnameMcFarlaneen
local.contributor.lastnameBanksen
local.contributor.lastnameHardenen
dc.identifier.staffune-id:jmcfarlaen
local.profile.orcid0000-0003-4429-5384en
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:2854en
dc.identifier.academiclevelAcademicen
local.title.maintitleAssociation of plasma metabolites and hormones with the growth and composition of lambs as affected by nutrition and sire geneticsen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.search.authorHegarty, R Sen
local.search.authorMcFarlane, J Ren
local.search.authorBanks, Ren
local.search.authorHarden, Sen
local.uneassociationUnknownen
local.year.published2006en
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