Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/9070
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dc.contributor.authorGreenwood, Paulen
dc.contributor.authorHarden, Sen
dc.contributor.authorHopkins, DLen
dc.date.accessioned2011-12-14T17:14:00Z-
dc.date.issued2007-
dc.identifier.citationAustralian Journal of Experimental Agriculture, 47(10), p. 1137-1146en
dc.identifier.issn1446-5574en
dc.identifier.issn0816-1089en
dc.identifier.issn1836-5787en
dc.identifier.issn1836-0939en
dc.identifier.urihttps://hdl.handle.net/1959.11/9070-
dc.description.abstractThe objective of this study was to determine the extent to which sire breed (Merino, primarily a wool-producing breed, and Poll Dorset, primarily a meat-producing breed), gender (castrate and ewe), rearing type (single- or multiple-reared), age (4, 8, 14 and 22 months) and carcass weight influence ovine (n = 204) myofibre characteristics. In Merino-sired sheep, the relative area (% of total myofibre area) of type 2X myofibres was lower and of type 2A myofibres higher in the 'longissimus lumborum' ('longissimus') muscle than in Poll Dorset-sired sheep. Female sheep had a higher relative area of type 2X and a lower relative area of type 2A myofibres than castrate sheep in the 'longissimus' muscle. The percentage of type 2A myofibres increased and of type 2X myofibres decreased in the 'longissimus' between 4 and 22 months of age. Type 1 myofibres in the 'semitendinosus' muscle were more prevalent and type 2X myofibres less prevalent in Merino than in Poll Dorset-sired sheep. The percentage of type 1 myofibres was lower in female than in castrate sheep. Age-related effects on 'semitendinosus' myofibre characteristics varied with gender, sire breed and rearing type. Influences of rearing type on myofibre characteristics were evident in the 'semitendinosus' muscle at younger ages, but did not persist to 22 months of age. The greatest increases in myofibre cross-sectional areas occurred between 8 and 14 months of age in the 'longissimus' muscle, and between 14 and 22 months of age in the 'semitendinosus' muscle. Carcass weight significantly influenced cross-sectional area of type 2A, 2AX and 2X myofibres in 'longissimus' and 'semitendinosus' muscles. It is concluded that influences of sire breed, gender, rearing type, age and carcass weight on ovine myofibre percentages varies between 'longissimus' and 'semitendinosus' muscles. Furthermore, the pattern of postnatal myofibre growth differs between these muscles.en
dc.languageenen
dc.publisherCSIRO Publishingen
dc.relation.ispartofAustralian Journal of Experimental Agricultureen
dc.titleMyofibre characteristics of ovine 'longissimus' and 'semitendinosus' muscles are influenced by sire breed, gender, rearing type, age and carcass weighten
dc.typeJournal Articleen
dc.identifier.doi10.1071/EA06324en
dc.subject.keywordsAnimal Breedingen
dc.subject.keywordsAnimal Growth and Developmenten
local.contributor.firstnamePaulen
local.contributor.firstnameSen
local.contributor.firstnameDLen
local.subject.for2008070202 Animal Growth and Developmenten
local.subject.for2008070201 Animal Breedingen
local.subject.seo2008830301 Beef Cattleen
local.subject.seo2008830302 Dairy Cattleen
local.profile.emailpaul.greenwood@industry.nsw.gov.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune-20111205-094327en
local.publisher.placeAustraliaen
local.format.startpage1137en
local.format.endpage1146en
local.peerreviewedYesen
local.identifier.volume47en
local.identifier.issue10en
local.contributor.lastnameGreenwooden
local.contributor.lastnameHardenen
local.contributor.lastnameHopkinsen
dc.identifier.staffune-id:pgreenw2en
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:9260en
local.title.maintitleMyofibre characteristics of ovine 'longissimus' and 'semitendinosus' muscles are influenced by sire breed, gender, rearing type, age and carcass weighten
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.search.authorGreenwood, Paulen
local.search.authorHarden, Sen
local.search.authorHopkins, DLen
local.uneassociationUnknownen
local.year.published2007en
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