Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/15040
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dc.contributor.authorWolcott, Matthew Len
dc.contributor.authorJohnston, Daviden
dc.contributor.authorBarwick, Stephenen
dc.contributor.authorCorbet, N Jen
dc.contributor.authorBurrow, Heather Men
dc.date.accessioned2014-05-12T16:35:00Z-
dc.date.issued2014-
dc.identifier.citationAnimal Production Science, 54(1), p. 85-96en
dc.identifier.issn1836-5787en
dc.identifier.issn1836-0939en
dc.identifier.urihttps://hdl.handle.net/1959.11/15040-
dc.description.abstractSteer growth and carcass composition, and female reproductive performance have been identified as key aspects of productivity by breeders of tropically adapted beef cattle in Australia. Research has also demonstrated that traits describing meat quality and feed intake and efficiency are of economic importance to Australia's beef industry. The present study aimed to determine genetic relationships of traits describing steer growth, feed intake and efficiency, carcass composition and meat quality with female reproductive performance in two genotypes of tropically adapted beef cattle. Female reproduction traits describing outcomes of first (Mating 1) and second (Mating 2) annual matings and lifetime reproduction (averaged over 6 matings) were analysed for 1020 Brahman (BRAH) and 1117 Tropical Composite (TCOMP) females. Steer traits were available for 1007 BRAH and 1210 TCOMP half-sibs of the females evaluated for reproductive performance, and measurements of liveweight and body composition for 1025 BRAH and 1520 TCOMP bull progeny of the same females were included in the analysis. Results demonstrated that selection to increase steer carcass weight and eye muscle area and decrease carcass fat depth would have no significant unfavourable impact on female reproductive performance for both genotypes. Measures of liveweight, eye muscle area and P8 fat depth in young BRAH bulls, however, were only moderately correlated with steer carcass equivalents (rg = 0.28 to 0.55) and results showed that selection on the basis of bull measurements alone may negatively affect female lifetime annual calving rate (rg = -0.44 to -0.75) if both were not included in a multi-trait genetic evaluation and considered when making selection decisions. More favourable (lower) net feed intake in BRAH steers was genetically associated with lower Mating 1 weaning rate (rg = 0.76) and higher days to calving (rg = -0.50), although this did not significantly affect lifetime annual calving or weaning rate (rg = 0.10 and 0.29, respectively). For TCOMP, higher steer carcass P8 fat depth was unfavourably genetically associated with female Mating 2 weaning rate (rg = -0.76), although these relationships were not as strong for weaning rate at Mating 1 or when averaged over the animals lifetime (rg = 0.43 and -0.13, respectively). Lower (more favourable) shear force (a measure of tenderness) also displayed a significant genetic association with higher (less favourable) Mating 1 days to calving in TCOMP and, while standard errors were high, tended to be unfavourably associated with other measures of female reproduction evaluated for the present study. Steer growth, carcass composition, meat quality and residual feed intake and female reproduction could be improved simultaneously if measurements describing both are included in a multi-trait genetic evaluation. Results of the present study also showed that expanding female reproduction traits to include descriptors of first and second mating outcomes, as well as lifetime reproductive performance, would allow a fuller account to be taken of genetic relationships of male traits with female reproduction.en
dc.languageenen
dc.publisherCSIRO Publishingen
dc.relation.ispartofAnimal Production Scienceen
dc.titleGenetic relationships between steer performance and female reproduction and possible impacts on whole herd productivity in two tropical beef genotypesen
dc.typeJournal Articleen
dc.identifier.doi10.1071/AN13141en
dc.subject.keywordsAnimal Breedingen
local.contributor.firstnameMatthew Len
local.contributor.firstnameDaviden
local.contributor.firstnameStephenen
local.contributor.firstnameN Jen
local.contributor.firstnameHeather Men
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.schoolSchool of Environmental and Rural Scienceen
local.profile.emailmwolcott@une.edu.auen
local.profile.emaildjohnsto@une.edu.auen
local.profile.emailsbarwick@une.edu.auen
local.profile.emailhburrow2@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune-20140414-153824en
local.publisher.placeAustraliaen
local.format.startpage85en
local.format.endpage96en
local.identifier.scopusid84890939194en
local.peerreviewedYesen
local.identifier.volume54en
local.identifier.issue1en
local.contributor.lastnameWolcotten
local.contributor.lastnameJohnstonen
local.contributor.lastnameBarwicken
local.contributor.lastnameCorbeten
local.contributor.lastnameBurrowen
dc.identifier.staffune-id:mwolcotten
dc.identifier.staffune-id:djohnstoen
dc.identifier.staffune-id:sbarwicken
dc.identifier.staffune-id:hburrow2en
local.profile.orcid0000-0001-6786-8742en
local.profile.orcid0000-0002-4995-8311en
local.profile.orcid0000-0002-7989-0426en
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:15255en
local.identifier.handlehttps://hdl.handle.net/1959.11/15040en
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
local.title.maintitleGenetic relationships between steer performance and female reproduction and possible impacts on whole herd productivity in two tropical beef genotypesen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.search.authorWolcott, Matthew Len
local.search.authorJohnston, Daviden
local.search.authorBarwick, Stephenen
local.search.authorCorbet, N Jen
local.search.authorBurrow, Heather Men
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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