Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/6020
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dc.contributor.authorFozi, M Asadien
dc.contributor.authorVan Der Werf, Julius Hen
dc.contributor.authorSwan, Andrewen
dc.date.accessioned2010-05-26T14:31:00Z-
dc.date.issued2007-
dc.identifier.citationAustralian Journal of Agricultural Research, 58(9), p. 921-927en
dc.identifier.issn1444-9838en
dc.identifier.issn0004-9409en
dc.identifier.issn1836-5795en
dc.identifier.issn1836-0947en
dc.identifier.urihttps://hdl.handle.net/1959.11/6020-
dc.description.abstractGenetic parameters for skin follicle traits, wool traits, body weight, and number of lambs weaned per ewe joined were estimated for 5108 10-month-old Australian fine-wool Merinos born between 1990 and 1996. These animals were descended from 261 sires and 2508 dams. The skin follicle number index that is based on skin surface area, and primary, secondary, or total follicle density were introduced as possible early-age selection criteria estimated at 6 months of age. Heritability estimates for total, secondary, and primary follicle number index were 0.45±0.04, 0.46±0.04, and 0.38±0.04, respectively. The genetic correlations of total follicle number index with clean fleece weight, mean fibre diameter, staple strength, coefficient of variation of fibre diameter, body weight, and number of lambs weaned were 0.16, −0.67, 0.00, 0.03, 0.22, and 0.22, respectively. Responses to selection on indices including and excluding follicle traits were calculated based on the genetic parameters estimated, and with annual responses calculated using an optimised age structure. On average, 10% greater response was predicted when total follicle number index was used as an additional selection criterion in different micron premium scenarios. In comparison, skin follicle density had a smaller effect on genetic improvement. The extra response was ∼1%. Similar index responses were obtained when total follicle number index was used as a replacement selection criterion for clean fleece weight, mean fibre diameter, and coefficient of variation of fibre diameter for breeding objectives with low emphasis on fibre diameter. In objectives with high emphasis on fibre diameter, unfavourable correlated responses in staple strength and CV of fibre diameter limited the effectiveness of using total follicle number index as a selection criterion. Although the use of total follicle number index as an additional selection criterion can be favourable for some breeding objectives, measuring this trait is currently cost prohibitive to inclusion in Merino breeding programs.en
dc.languageenen
dc.publisherCSIRO Publishingen
dc.relation.ispartofAustralian Journal of Agricultural Researchen
dc.titleInclusion of skin follicle traits in selection indices in breeding programs improves genetic gain in Australian fine-wool Merinosen
dc.typeJournal Articleen
dc.identifier.doi10.1071/AR06347en
dc.subject.keywordsAnimal Breedingen
local.contributor.firstnameM Asadien
local.contributor.firstnameJulius Hen
local.contributor.firstnameAndrewen
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.emailjvanderw@une.edu.auen
local.profile.emailaswan@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune-20100423-141945en
local.publisher.placeAustraliaen
local.format.startpage921en
local.format.endpage927en
local.identifier.scopusid34848872257en
local.peerreviewedYesen
local.identifier.volume58en
local.identifier.issue9en
local.contributor.lastnameFozien
local.contributor.lastnameVan Der Werfen
local.contributor.lastnameSwanen
dc.identifier.staffune-id:jvanderwen
dc.identifier.staffune-id:aswanen
local.profile.orcid0000-0003-2512-1696en
local.profile.orcid0000-0001-8048-3169en
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:6170en
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
local.title.maintitleInclusion of skin follicle traits in selection indices in breeding programs improves genetic gain in Australian fine-wool Merinosen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.search.authorFozi, M Asadien
local.search.authorVan Der Werf, Julius Hen
local.search.authorSwan, Andrewen
local.uneassociationUnknownen
local.year.published2007en
Appears in Collections:Animal Genetics and Breeding Unit (AGBU)
Journal Article
School of Environmental and Rural Science
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