Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/18890
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dc.contributor.authorCottle, Daviden
dc.contributor.authorGilmour, Arthur Ren
dc.contributor.authorPabiou, Thierryen
dc.contributor.authorAmer, Peteren
dc.contributor.authorFahey, Alanen
dc.date.accessioned2016-04-15T10:05:00Z-
dc.date.issued2016-
dc.identifier.citationJournal of Animal Breeding and Genetics, 133(2), p. 126-137en
dc.identifier.issn1439-0388en
dc.identifier.issn0931-2668en
dc.identifier.urihttps://hdl.handle.net/1959.11/18890-
dc.description.abstractIt is sometimes possible to breed for more uniform individuals by selecting animals with a greater tendency to be less variable, that is, those with a smaller environmental variance. This approach has been applied to reproduction traits in various animal species. We have evaluated fecundity in the Irish Belclare sheep breed by analyses of flocks with differing average litter size (number of lambs per ewe per year, NLB) and have estimated the genetic variance in environmental variance of lambing traits usingdouble hierarchical generalized linear models (DHGLM). The data set comprised of 9470 litter size records from 4407 ewes collected in 56 flocks. The percentage of pedigreed lambing ewes with singles, twins and triplets was 30, 54 and 14%, respectively, in 2013 and has been relatively constant for the last 15 years. The variance of NLB increases with the mean in this data; the correlation of mean and standard deviation across sires is 0.50. The breeding goal is to increase the mean NLB without unduly increasing the incidence of triplets and higher litter sizes. The heritability estimates for lambing traits were NLB, 0.09; triplet occurrence (TRI) 0.07; and twin occurrence (TWN), 0.02. The highest and lowest twinning flocks differed by 23% (75% versus 52%) in the proportion of ewes lambing twins. Fitting bivariate sire models to NLB and the residual from the NLB model using a double hierarchical generalized linear model (DHGLM) model found a strong genetic correlation (0.88 ± 0.07) between the sire effect for the magnitude of the residual (VE) and sire effects for NLB, confirming the general observation that increased average litter size is associated with increased variability in litter size. We propose a threshold model that may help breeders with low litter size increase the percentage of twin bearers without unduly increasing the percentage of ewes bearing triplets in Belclare sheep.en
dc.languageenen
dc.publisherWiley-Blackwell Verlag GmbHen
dc.relation.ispartofJournal of Animal Breeding and Geneticsen
dc.titleGenetic selection for increased mean and reduced variance of twinning rate in Belclare ewesen
dc.typeJournal Articleen
dc.identifier.doi10.1111/jbg.12173en
dc.subject.keywordsAnimal Breedingen
local.contributor.firstnameDaviden
local.contributor.firstnameArthur Ren
local.contributor.firstnameThierryen
local.contributor.firstnamePeteren
local.contributor.firstnameAlanen
local.subject.for2008070201 Animal Breedingen
local.subject.seo2008830311 Sheep - Woolen
local.subject.seo2008830310 Sheep - Meaten
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.schoolAnimal Scienceen
local.profile.schoolAnimal Scienceen
local.profile.schoolAnimal Scienceen
local.profile.emaildcottle2@une.edu.auen
local.profile.emailpamer@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune-20150731-12152en
local.publisher.placeGermanyen
local.format.startpage126en
local.format.endpage137en
local.identifier.scopusid84961111940en
local.peerreviewedYesen
local.identifier.volume133en
local.identifier.issue2en
local.contributor.lastnameCottleen
local.contributor.lastnameGilmouren
local.contributor.lastnamePabiouen
local.contributor.lastnameAmeren
local.contributor.lastnameFaheyen
dc.identifier.staffune-id:dcottle2en
dc.identifier.staffune-id:pameren
local.profile.orcid0000-0003-3875-3465en
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:19091en
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
local.title.maintitleGenetic selection for increased mean and reduced variance of twinning rate in Belclare ewesen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.search.authorCottle, Daviden
local.search.authorGilmour, Arthur Ren
local.search.authorPabiou, Thierryen
local.search.authorAmer, Peteren
local.search.authorFahey, Alanen
local.uneassociationUnknownen
local.identifier.wosid000372889900007en
local.year.published2016en
local.fileurl.closedpublishedhttps://rune.une.edu.au/web/retrieve/c37d0aef-8abf-4f2d-85b5-f8c7d83a408ben
local.subject.for2020300305 Animal reproduction and breedingen
local.subject.seo2020100413 Sheep for woolen
local.subject.seo2020100412 Sheep for meaten
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