Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/21483
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dc.contributor.authorNewton, J Een
dc.contributor.authorBrown, Danielen
dc.contributor.authorDominik, Sonjaen
dc.contributor.authorVan Der Werf, Julius Hen
dc.date.accessioned2017-07-17T11:00:00Z-
dc.date.issued2017-
dc.identifier.citationAnimal Production Science, 57(8), p. 1653-1664en
dc.identifier.issn1836-5787en
dc.identifier.issn1836-0939en
dc.identifier.urihttps://hdl.handle.net/1959.11/21483-
dc.description.abstractGenomic selection could be useful in sheep-breeding programs, especially if rams and ewes are first mated at an earlier age than is the current industry practice. However, young-ewe (1 year old) fertility rates are known to be lower and more variable than those of mature ewes. The aim of the present study was to evaluate how young-ewe fertility rate affects risk and expected genetic gain in Australian sheep-breeding programs that use genomic information and select ewes and rams at different ages. The study used stochastic simulation to model different flock age structures and young-ewe fertility levels with and without genomic information for Merino and maternal sheep-breeding programs. The results from 10 years of selection were used to compare breeding programs on the basis of the mean and variation in genetic gain. Ram and ewe age, availability of genomic information on males and young-ewe fertility level all significantly (P < 0.05) affected expected genetic gain. Higher young-ewe fertility rates significantly increased expected genetic gain. Low fertility rate of young ewes (10%) resulted in net genetic gain similar to not selecting ewes until they were 19 months old and did not increase breeding-program risk, as the likelihood of genetic gain being lower than the range of possible solutions from a breeding program with late selection of both sexes was zero. Genomic information was of significantly (P < 0.05) more value for 1-year-old rams than for 2-year-old rams. Unless genomic information was available, early mating of rams offered no greater gain in Merino breeding programs and increased breeding-program risk. It is concluded that genomic information decreases the risk associated with selecting replacements at 7 months of age. Genetic progress is unlikely to be adversely affected if fertility levels above 10% can be achieved. Whether the joining of young ewes is a viable management decision for a breeder will depend on the fertility level that can be achieved in their young ewes and on other costs associated with the early mating of ewes.en
dc.languageenen
dc.publisherCSIRO Publishingen
dc.relation.ispartofAnimal Production Scienceen
dc.titleImpact of young ewe fertility rate on risk and genetic gain in sheep-breeding programs using genomic selectionen
dc.typeJournal Articleen
dc.identifier.doi10.1071/an15321en
dc.subject.keywordsAnimal Breedingen
local.contributor.firstnameJ Een
local.contributor.firstnameDanielen
local.contributor.firstnameSonjaen
local.contributor.firstnameJulius Hen
local.subject.for2008070201 Animal Breedingen
local.subject.seo2008830311 Sheep - Woolen
local.profile.schoolAnimal Genetics and Breeding Uniten
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.emaildbrown2@une.edu.auen
local.profile.emailsdomini2@une.edu.auen
local.profile.emailjvanderw@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune-20161128-090238en
local.publisher.placeAustraliaen
local.format.startpage1653en
local.format.endpage1664en
local.identifier.scopusid85021356151en
local.peerreviewedYesen
local.identifier.volume57en
local.identifier.issue8en
local.contributor.lastnameNewtonen
local.contributor.lastnameBrownen
local.contributor.lastnameDominiken
local.contributor.lastnameVan Der Werfen
dc.identifier.staffune-id:dbrown2en
dc.identifier.staffune-id:sdomini2en
dc.identifier.staffune-id:jvanderwen
local.profile.orcid0000-0002-4786-7563en
local.profile.orcid0000-0002-1942-8539en
local.profile.orcid0000-0003-2512-1696en
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:21674en
local.identifier.handlehttps://hdl.handle.net/1959.11/21483en
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
local.title.maintitleImpact of young ewe fertility rate on risk and genetic gain in sheep-breeding programs using genomic selectionen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.search.authorNewton, J Een
local.search.authorBrown, Danielen
local.search.authorDominik, Sonjaen
local.search.authorVan Der Werf, Julius Hen
local.uneassociationUnknownen
local.year.published2017en
local.fileurl.closedpublishedhttps://rune.une.edu.au/web/retrieve/d83a9c10-0888-43e9-a825-9f9a3d68638een
local.subject.for2020300305 Animal reproduction and breedingen
local.subject.seo2020100413 Sheep for woolen
Appears in Collections:Animal Genetics and Breeding Unit (AGBU)
Journal Article
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