Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/4227
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dc.contributor.authorJohnston, Daviden
dc.contributor.authorBarwick, Stephenen
dc.contributor.authorHolroyd, R Gen
dc.contributor.authorFordyce, Gen
dc.contributor.authorBurrow, Heather Maryen
local.source.editorEditor(s): Heather Burrowen
dc.date.accessioned2010-01-20T16:03:00Z
dc.date.issued2006en
dc.identifier.citationAustralian beef - the leader!: The impact of science on the beef industry, p. 47-52en
dc.identifier.urihttps://hdl.handle.net/1959.11/4227en
dc.description.abstractThe genetics of heifer pubertal traits and their associations with female reproductive performance were estimated using records from 2,115 heifers representing 2 tropically adapted genotypes raised in northern Australia. Heifers were ultrasound scanned for ovarian activity every 4-6 weeks to determine the age at first observed corpus luteum (CL). Heifer live weight (WTCL) and ultrasound scanned fat depth (FATCL) were also recorded at this time. Heifers were mated at approximately 2 years of age and genetic and phenotypic relationships were estimated between days to calving (DC1), calving success (CS1) and age at first CL (AGECL). Results showed large genotype, location and birth month effects on age and fatness at first CL but not weight at first CL. Age at presence of the first CL (AGECL) was moderately to highly heritable: 0.57 and 0.52 for Brahmans and Tropical Composites, respectively. Other pubertal traits were also moderately heritable. Heritability estimates for DC1 and CS1, were 0.16 and 0.18 for Brahmans and 0.11 and 0.08 for Tropical Composites, respectively. DC1 and CS1 were genetically correlated with AGECL, particularly for Brahmans (0.87 and -0.58, respectively). Selection to improve first parity female reproductive performance is feasible in both genotypes, and for Brahmans AGECL could be used as an indirect selection criterion provided it can be measured cost effectively in industry. Associations with lifetime reproductive performance will be required before final recommendations can be made on recording and selection breeding schemes.en
dc.languageenen
dc.publisherCRC (Cooperative Research Centre) for Beef Genetic Technologiesen
dc.relation.ispartofAustralian beef - the leader!: The impact of science on the beef industryen
dc.titleGenetics of female reproduction traitsen
dc.typeConference Publicationen
dc.relation.conferenceAustralian Beef - the Leader! Conference, Armidale, NSW, Australia, March 7 - March 8 2006en
dc.subject.keywordsAnimal Breedingen
local.contributor.firstnameDaviden
local.contributor.firstnameStephenen
local.contributor.firstnameR Gen
local.contributor.firstnameGen
local.contributor.firstnameHeather Maryen
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.emaildjohnsto@une.edu.auen
local.profile.emailsbarwick@une.edu.auen
local.profile.emailhburrow3@une.edu.auen
local.output.categoryE2en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordpes:4408en
local.publisher.placeArmidale, NSW, Australiaen
local.format.startpage47en
local.format.endpage52en
local.contributor.lastnameJohnstonen
local.contributor.lastnameBarwicken
local.contributor.lastnameHolroyden
local.contributor.lastnameFordyceen
local.contributor.lastnameBurrowen
dc.identifier.staffune-id:djohnstoen
dc.identifier.staffune-id:sbarwicken
dc.identifier.staffune-id:hburrowen
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:4328en
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
local.title.maintitleGenetics of female reproduction traitsen
local.output.categorydescriptionE2 Non-Refereed Scholarly Conference Publicationen
local.relation.urlhttp://trove.nla.gov.au/work/32004765?selectedversion=NBD41790925en
local.conference.detailsAustralian Beef - the Leader! Conference, Armidale, NSW, Australia, March 7 - March 8 2006en
local.description.statisticsepubsVisitors: 252<br />Views: 252<br />Downloads: 0en
local.search.authorJohnston, Daviden
local.search.authorBarwick, Stephenen
local.search.authorHolroyd, R Gen
local.search.authorFordyce, Gen
local.search.authorBurrow, Heather Maryen
Appears in Collections:Animal Genetics and Breeding Unit (AGBU)
Conference Publication
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