Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/15034
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dc.contributor.authorBunter, Kim Len
dc.contributor.authorJohnston, Daviden
dc.contributor.authorWolcott, Matthew Len
dc.contributor.authorFordyce, Gen
dc.date.accessioned2014-05-12T16:01:00Z-
dc.date.issued2014-
dc.identifier.citationAnimal Production Science, 54(1), p. 25-36en
dc.identifier.issn1836-5787en
dc.identifier.issn1836-0939en
dc.identifier.urihttps://hdl.handle.net/1959.11/15034-
dc.description.abstractData from 9296 calves born to 2078 dams over 9 years across five sites were used to investigate factors associated with calf mortality for tropically adapted breeds (Brahman and Tropical Composite) recorded in extensive production systems, using multivariate logistic regression. The average calf mortality pre-weaning was 9.5% of calves born, varying from 1.5% to 41% across all sites and years. In total, 67% of calves that died did so within a week of their birth, with cause of death most frequently recorded as unknown. The major factors significantly (P < 0.05) associated with mortality for potentially large numbers of calves included the specific production environment represented by site-year, low calf birthweight (more so than high birthweight) and horn status at branding. Almost all calf deaths post-branding (assessed from n = 8348 calves) occurred in calves that were dehorned, totalling 2.1% of dehorned calves and 15.9% of all calf deaths recorded. Breed effects on calf mortality were primarily the result of breed differences in calf birthweight and, to a lesser extent, large teat size of cows; however, differences in other breed characteristics could be important. Twin births and calves assisted at birth had a very high risk of mortality, but <1% of calves were twins and few calves were assisted at birth. Conversely, it could not be established how many calves would have benefitted from assistance at birth. Cow age group and outcome from the previous season were also associated with current calf mortality; maiden or young cows (<4 years old) had increased calf losses overall. More mature cows with a previous outcome of calf loss were also more likely to have another calf loss in the subsequent year, and this should be considered for culling decisions. Closer attention to the management of younger cows is warranted to improve calf survival.en
dc.languageenen
dc.publisherCSIRO Publishingen
dc.relation.ispartofAnimal Production Scienceen
dc.titleFactors associated with calf mortality in tropically adapted beef breeds managed in extensive Australian production systemsen
dc.typeJournal Articleen
dc.identifier.doi10.1071/AN12421en
dc.subject.keywordsAnimal Breedingen
local.contributor.firstnameKim Len
local.contributor.firstnameDaviden
local.contributor.firstnameMatthew Len
local.contributor.firstnameGen
local.subject.for2008070201 Animal Breedingen
local.subject.seo2008830301 Beef Cattleen
local.profile.schoolAnimal Genetics and Breeding Uniten
local.profile.schoolAnimal Genetics and Breeding Uniten
local.profile.schoolAnimal Genetics and Breeding Uniten
local.profile.emailkbunter2@une.edu.auen
local.profile.emaildjohnsto@une.edu.auen
local.profile.emailmwolcott@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune-20140414-14538en
local.publisher.placeAustraliaen
local.format.startpage25en
local.format.endpage36en
local.identifier.scopusid84890900905en
local.peerreviewedYesen
local.identifier.volume54en
local.identifier.issue1en
local.contributor.lastnameBunteren
local.contributor.lastnameJohnstonen
local.contributor.lastnameWolcotten
local.contributor.lastnameFordyceen
dc.identifier.staffune-id:kbunter2en
dc.identifier.staffune-id:djohnstoen
dc.identifier.staffune-id:mwolcotten
local.profile.orcid0000-0001-5587-4416en
local.profile.orcid0000-0002-4995-8311en
local.profile.orcid0000-0001-6786-8742en
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:15249en
local.identifier.handlehttps://hdl.handle.net/1959.11/15034en
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
local.title.maintitleFactors associated with calf mortality in tropically adapted beef breeds managed in extensive Australian production systemsen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.search.authorBunter, Kim Len
local.search.authorJohnston, Daviden
local.search.authorWolcott, Matthew Len
local.search.authorFordyce, Gen
local.uneassociationUnknownen
local.year.published2014en
local.subject.for2020300305 Animal reproduction and breedingen
local.subject.seo2020100401 Beef cattleen
Appears in Collections:Animal Genetics and Breeding Unit (AGBU)
Journal Article
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