Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/18811
Full metadata record
DC FieldValueLanguage
dc.contributor.authorRose, Gen
dc.contributor.authorMulder, H Aen
dc.contributor.authorVan Der Werf, Julius Hen
dc.contributor.authorThompson, A Nen
dc.contributor.authorvan Arendonk, J A Men
dc.date.accessioned2016-04-04T09:29:00Z
dc.date.issued2014en
dc.identifier.citationJournal of Animal Science, 92(8), p. 3249-3257en
dc.identifier.issn1525-3163en
dc.identifier.issn0021-8812en
dc.identifier.urihttps://hdl.handle.net/1959.11/18811en
dc.description.abstractMerino sheep in Australia experience periods of variable feed supply. Merino sheep can be bred to be more resilient to this variation by losing less BW when grazing poor quality pasture and gaining more BW when grazing good quality pasture. Therefore, selection on BW change might be economically attractive but correlations with other traits in the breeding objective need to be known. The genetic correlations (rg) between BW, BW change, and reproduction were estimated using records from approximately 7,350 fully pedigreed Merino ewes managed at Katanning in Western Australia. Number of lambs and total weight of lambs born and weaned were measured on approximately 5,300 2-yr-old ewes, approximately 4,900 3-yr-old ewes, and approximately 3,600 4-yr-old ewes. On a proportion of these ewes BW change was measured: approximately 1,950 2-yr-old ewes, approximately 1,500 3-yr-old ewes, and approximately 1,100 4-yr-old ewes. The BW measurements were for 3 periods. The first period was during mating period over 42 d on poor pasture. The second period was during pregnancy over 90 d for ewes that got pregnant on poor and medium quality pasture. The third period was during lactation over 130 d for ewes that weaned a lamb on good quality pasture. Genetic correlations between weight change and reproduction were estimated within age classes. Genetic correlations were tested to be significantly greater magnitude than 0 using likelihood ratio tests. Nearly all BW had significant positive genetic correlations with all reproduction traits. In 2-yr-old ewes, BW change during the mating period had a positive genetic correlation with number of lambs weaned (rg = 0.58); BW change during pregnancy had a positive genetic correlation with total weight of lambs born (rg = 0.33) and a negative genetic correlation with number of lambs weaned (rg = -0.49). All other genetic correlations were not significantly greater magnitude than 0 but estimates of genetic correlations for 3-yr-old ewes were generally consistent with these findings. The direction of the genetic correlations mostly coincided with the energy requirements of the ewes and the stage of maturity of the ewes. In conclusion, optimized selection strategies on BW changes to increase resilience will depend on the genetic correlations with reproduction and are dependent on age.en
dc.languageenen
dc.publisherAmercian Society of Animal Scienceen
dc.relation.ispartofJournal of Animal Scienceen
dc.titleGenetic correlations between body weight change and reproduction traits in Merino ewes depend on ageen
dc.typeJournal Articleen
dc.identifier.doi10.2527/jas.2013-7378en
dc.subject.keywordsAnimal Breedingen
local.contributor.firstnameGen
local.contributor.firstnameH Aen
local.contributor.firstnameJulius Hen
local.contributor.firstnameA Nen
local.contributor.firstnameJ A Men
local.subject.for2008070201 Animal Breedingen
local.subject.seo2008830311 Sheep - Woolen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.emailjvanderw@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune-20150331-151321en
local.publisher.placeChampaign, United States of Americaen
local.format.startpage3249en
local.format.endpage3257en
local.peerreviewedYesen
local.identifier.volume92en
local.identifier.issue8en
local.contributor.lastnameRoseen
local.contributor.lastnameMulderen
local.contributor.lastnameVan Der Werfen
local.contributor.lastnameThompsonen
local.contributor.lastnamevan Arendonken
dc.identifier.staffune-id:jvanderwen
local.profile.orcid0000-0003-2512-1696en
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:19012en
dc.identifier.academiclevelAcademicen
local.title.maintitleGenetic correlations between body weight change and reproduction traits in Merino ewes depend on ageen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.description.statisticsepubsVisitors: 72<br />Views: 80<br />Downloads: 2en
local.search.authorRose, Gen
local.search.authorMulder, H Aen
local.search.authorVan Der Werf, Julius Hen
local.search.authorThompson, A Nen
local.search.authorvan Arendonk, J A Men
Appears in Collections:Journal Article
School of Environmental and Rural Science
Files in This Item:
2 files
File Description SizeFormat 
Show simple item record

SCOPUSTM   
Citations

1
checked on Nov 26, 2018

Page view(s)

32
checked on Jan 12, 2019
Google Media

Google ScholarTM

Check

Altmetric


Items in Research UNE are protected by copyright, with all rights reserved, unless otherwise indicated.