Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/9072
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dc.contributor.authorWarner, RDen
dc.contributor.authorPethick, David Wen
dc.contributor.authorGreenwood, Paulen
dc.contributor.authorPonnampalam, ENen
dc.contributor.authorBanks, Roberten
dc.contributor.authorHopkins, DLen
dc.date.accessioned2011-12-14T17:28:00Z-
dc.date.issued2007-
dc.identifier.citationAustralian Journal of Experimental Agriculture, 47(10), p. 1229-1238en
dc.identifier.issn1446-5574en
dc.identifier.issn0816-1089en
dc.identifier.issn1836-5787en
dc.identifier.issn1836-0939en
dc.identifier.urihttps://hdl.handle.net/1959.11/9072-
dc.description.abstractThe combined effects of age and genetics and Poll Dorset sire and growth path were studied in two separate experiments (n = 595 and 627, respectively). In the first experiment, containing genotype crosses typically used in Australia (Merino, Poll Dorset, Border Leicester) and sires selected for growth or muscling, sheep were slaughtered at 4, 8, 14 and 22 months. The second experiment used Poll Dorset sires selected for high muscling, fat or growth with progeny having two levels of nutrition postweaning. Border Leicesters expressed higher levels of carcass fat percentage and intramuscular fat and produced the heaviest carcass. Merinos had the lowest subcutaneous fat depth and highest carcass lean percentage when compared at the same age. The progeny of Poll Dorset sires selected for high muscling (PDm) expressed a shift toward glycolytic fibres relative to those from Merino sires, and PDm sires produced progeny with reduced spine and limb length and higher carcass muscle : mineral ratios, suggesting skeletal stunting. Genotype meat quality differences were minimal except that PDm sire topsides were tougher and Merinos produced higher pH meat. With age (4-22 months), lambs became heavier and fatter, fibres shifted towards oxidative and away from glycolytic, muscle myoglobin increased, the meat became darker and redder and tenderness declined. Early weaning had no effect on the time to reach slaughter weight, provided nutrition was not restricted. The sire genetics influence on the carcass composition far outweighed the effect of nutrition postweaning. Lambs on a restricted diet tended to have less acceptable meat quality but this was not evident in lambs from sires selected for high fatness. Sensory tenderness was improved and intramuscular fat was higher in lamb progeny from sires selected for high fatness.en
dc.languageenen
dc.publisherCSIRO Publishingen
dc.relation.ispartofAustralian Journal of Experimental Agricultureen
dc.titleUnravelling the complex interactions between genetics, animal age and nutrition as they impact on tissue deposition, muscle characteristics and quality of Australian sheep meaten
dc.typeJournal Articleen
dc.identifier.doi10.1071/EA07229en
dc.subject.keywordsAnimal Nutritionen
dc.subject.keywordsAnimal Breedingen
dc.subject.keywordsAnimal Growth and Developmenten
local.contributor.firstnameRDen
local.contributor.firstnameDavid Wen
local.contributor.firstnamePaulen
local.contributor.firstnameENen
local.contributor.firstnameRoberten
local.contributor.firstnameDLen
local.subject.for2008070202 Animal Growth and Developmenten
local.subject.for2008070201 Animal Breedingen
local.subject.for2008070204 Animal Nutritionen
local.subject.seo2008830310 Sheep - Meaten
local.profile.schoolAnimal Genetics and Breeding Uniten
local.profile.emailpaul.greenwood@industry.nsw.gov.auen
local.profile.emailrbanks@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune-20111205-095458en
local.publisher.placeAustraliaen
local.format.startpage1229en
local.format.endpage1238en
local.identifier.scopusid34548764962en
local.peerreviewedYesen
local.identifier.volume47en
local.identifier.issue10en
local.contributor.lastnameWarneren
local.contributor.lastnamePethicken
local.contributor.lastnameGreenwooden
local.contributor.lastnamePonnampalamen
local.contributor.lastnameBanksen
local.contributor.lastnameHopkinsen
dc.identifier.staffune-id:dpethicken
dc.identifier.staffune-id:pgreenw2en
dc.identifier.staffune-id:rbanksen
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:9262en
dc.identifier.academiclevelAcademicen
local.title.maintitleUnravelling the complex interactions between genetics, animal age and nutrition as they impact on tissue deposition, muscle characteristics and quality of Australian sheep meaten
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.search.authorWarner, RDen
local.search.authorPethick, David Wen
local.search.authorGreenwood, Paulen
local.search.authorPonnampalam, ENen
local.search.authorBanks, Roberten
local.search.authorHopkins, DLen
local.uneassociationUnknownen
local.year.published2007en
Appears in Collections:Animal Genetics and Breeding Unit (AGBU)
Journal Article
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