Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/6004
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dc.contributor.authorMortimer, Sue Ien
dc.contributor.authorRobinson, Dorothy Len
dc.contributor.authorAtkins, K Den
dc.contributor.authorBrien, F Den
dc.contributor.authorSwan, Andrewen
dc.contributor.authorTaylor, P Jen
dc.contributor.authorFogarty, N Men
dc.date.accessioned2010-05-26T13:08:00Z
dc.date.issued2009en
dc.identifier.citationAnimal Production Science, 49(1), p. 32-42en
dc.identifier.issn1836-0939en
dc.identifier.issn1836-5787en
dc.identifier.urihttps://hdl.handle.net/1959.11/6004en
dc.description.abstractHeritability was estimated for a range of visually assessed traits recorded on Merino sheep, together with the phenotypic and genetic correlations among the visually assessed traits and correlations of the visually assessed traits with measured wool production traits and liveweight. Data were derived from four research resource flocks, with a range of 12 958 to 57 128 records from animals with 478 to 1491 sires for the various traits. The estimates of heritability were high for the wool quality traits of handle, wool character and wool colour (0.33–0.34) and the conformation traits of face cover, neck wrinkle and body wrinkle (0.42–0.45), moderate for front leg structure (0.18) and low for back leg structure (0.13). Fleece rot score had low heritability (0.14), while classer grade was moderately heritable (0.20). Estimates of genetic correlations among the visually assessed wool quality traits were low to moderate in size and positive (0.17–0.47). Genetic correlation estimates among the assessed conformation traits were generally very low, except for the genetic correlations between scores for neck and body wrinkle (0.92±0.01) and front and back leg structure (0.31±0.09). Fleece rot score had low positive genetic correlations with neck and body wrinkle scores (0.18±0.05 and 0.15±0.05, respectively) and classer grade (0.26±0.06). Classer grade was slightly positively correlated with the wool quality traits (0.17–0.45) and leg structure traits (0.21–0.25). The genetic correlations among the visually assessed traits were generally neutral to favourable. The visually assessed wool quality traits had low to moderate favourable genetic correlations with mean and coefficient of variation of fibre diameter (0.19 –0.47), but negative correlations with clean wool yield (–0.26 to –0.37). Face cover was unfavourably correlated with staple length (–0.27±0.04) and liveweight (–0.23±0.02). Neck and body wrinkle scores were genetically associated with higher greasy (0.33–0.39) and clean fleece weights (0.19–0.22), greater coefficient of variation of fibre diameter (0.24–0.26) and fibre curvature (0.27–0.28), but with reduced yield (–0.26 to –0.28) and staple length (–0.34 to –0.41). Fleece rot score was genetically correlated with clean fleece weight (0.26±0.05) and coefficient of variation of fibre diameter (0.27±0.04). Classer grade was favourably correlated with greasy and clean fleece weights (–0.41 to –0.43), staple length (–0.29±0.04), liveweight (–0.36±0.03) and coefficient of variation of fibre diameter (0.27±0.03). Most genetic correlations between the visually assessed traits and the measured production traits and liveweight were close to zero and less than 0.2 in magnitude. This study provides accurate values for the parameter matrix required to incorporate visually assessed traits into breeding objectives and the genetic evaluation programs used in the Australian sheep industry, allowing the development of breeding objectives and indexes that optimally combine visually assessed performance and measured production in Merino sheep.en
dc.languageenen
dc.publisherCSIRO Publishingen
dc.relation.ispartofAnimal Production Scienceen
dc.titleGenetic parameters for visually assessed traits and their relationships to wool production and liveweight in Australian Merino sheepen
dc.typeJournal Articleen
dc.identifier.doi10.1071/EA08074en
dc.subject.keywordsAnimal Breedingen
local.contributor.firstnameSue Ien
local.contributor.firstnameDorothy Len
local.contributor.firstnameK Den
local.contributor.firstnameF Den
local.contributor.firstnameAndrewen
local.contributor.firstnameP Jen
local.contributor.firstnameN Men
local.subject.for2008070201 Animal Breedingen
local.subject.seo2008830311 Sheep - Woolen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.schoolAnimal Genetics and Breeding Uniten
local.profile.emailsue.mortimer@dpi.nsw.gov.auen
local.profile.emaildrobin27@une.edu.auen
local.profile.emailaswan@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune-20100423-142925en
local.publisher.placeAustraliaen
local.format.startpage32en
local.format.endpage42en
local.peerreviewedYesen
local.identifier.volume49en
local.identifier.issue1en
local.contributor.lastnameMortimeren
local.contributor.lastnameRobinsonen
local.contributor.lastnameAtkinsen
local.contributor.lastnameBrienen
local.contributor.lastnameSwanen
local.contributor.lastnameTayloren
local.contributor.lastnameFogartyen
dc.identifier.staffune-id:drobin27en
dc.identifier.staffune-id:aswanen
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:6152en
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
local.title.maintitleGenetic parameters for visually assessed traits and their relationships to wool production and liveweight in Australian Merino sheepen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.description.statisticsepubsVisitors: 203<br />Views: 207<br />Downloads: 0en
local.search.authorMortimer, Sue Ien
local.search.authorRobinson, Dorothy Len
local.search.authorAtkins, K Den
local.search.authorBrien, F Den
local.search.authorSwan, Andrewen
local.search.authorTaylor, P Jen
local.search.authorFogarty, N Men
Appears in Collections:Animal Genetics and Breeding Unit (AGBU)
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