Time class for racing performance of the Quarter Horse: Genetic parameters and trends using Bayesian and multivariate threshold models

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dc.contributor.authorFaria, Ricardo António Silva [UNESP]
dc.contributor.authorMaiorano, Amanda Marchi [UNESP]
dc.contributor.authorCorreia, Luiz Eduardo Cruz dos Santos [UNESP]
dc.contributor.authorSantana Jr, Mário Luiz
dc.contributor.authorSilva, Josineudson Augusto II Vasconcelos [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal de Rondonópolis
dc.date.accessioned2019-10-06T17:10:37Z
dc.date.available2019-10-06T17:10:37Z
dc.date.issued2019-07-01
dc.description.abstractThe aim of this study was to evaluate racing performance in the Quarter Horse breed in Brazil using genetic parameter estimates, breeding values, and genetic trends for a differentiated trait, time class (TC), at four different distances. The speed records comprising races that occurred between 1981 and 2011 were obtained from hippodromes in the states of São Paulo, Ceará, Brasília, and Mato Grosso do Sul. The final archive analysed contained 4263 horses born to 431 stallions and 1716 dams. These animals participated in 3904 races, providing 17,342 records of final racing time. The four TC traits were defined by 5 scores based on the final times (in seconds) of each animal in each race. The scores for formation of the classes were attributed within each race based on the percent difference from winner's time. Time class was evaluated at distances of 301, 320, 365 and 402 m, generating four phenotypic measures: TC301, TC320, TC365 and TC402, respectively. The genetic parameters were estimated by Bayesian inference in multivariate analysis using a threshold animal model. The model included the fixed effects of race, sex and age class of animal in the race, in addition to additive genetic, animal permanent environmental and residual random effects. The mean heritability estimates were of high magnitude and ranged from 0.45 ± 0.06 (TC402) to 0.56 ± 0.04 (TC365). Repeatability estimates ranged from 0.78 ± 0.06 (TC402) to 0.97 ± 0.01 (TC320). The additive genetic and animal permanent environmental correlations were positive, with mean correlations ranging from 0.33 ± 0.06 between TC301 and TC320 to 0.62 ± 0.06 between TC365 and TC402 and from 0.44 ± 0.08 between TC301 and TC320 to 0.58 ± 0.06 between TC365 and TC402, respectively. The mean breeding values transformed by the cumulative distribution function of the standard normal distribution ranged from 54.6 ± 25.3 (TC365) to 57.8 ± 28.5 (TC320) in the group of animals included in the pedigree and born after 1980. The genetic trends observed indicated that TC301 (301 m) exhibited the greatest evolution between 1981 and 2008. The results suggest the possible use of TC traits as selection criteria since they respond positively to selection, permitting genetic gains in breeding programs of racehorses.en
dc.description.affiliationUniversidade Estadual Paulista (Unesp) Faculdade de Ciências Agrárias e Veterinárias, PO Box 14884-900 Jaboticabal
dc.description.affiliationUniversidade Federal de Rondonópolis, PO Box 78735-901
dc.description.affiliationUniversidade Estadual Paulista (Unesp) Faculdade de Medicina Veterinária e Zootecnia, PO Box 18618-000 Botucatu
dc.description.affiliationUnespUniversidade Estadual Paulista (Unesp) Faculdade de Ciências Agrárias e Veterinárias, PO Box 14884-900 Jaboticabal
dc.description.affiliationUnespUniversidade Estadual Paulista (Unesp) Faculdade de Medicina Veterinária e Zootecnia, PO Box 18618-000 Botucatu
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipIdCAPES: 001
dc.format.extent116-122
dc.identifierhttp://dx.doi.org/10.1016/j.livsci.2019.05.013
dc.identifier.citationLivestock Science, v. 225, p. 116-122.
dc.identifier.doi10.1016/j.livsci.2019.05.013
dc.identifier.issn1871-1413
dc.identifier.scopus2-s2.0-85066159266
dc.identifier.urihttp://hdl.handle.net/11449/190358
dc.language.isoeng
dc.relation.ispartofLivestock Science
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectHeritability
dc.subjectHippodrome
dc.subjectHorserace
dc.subjectRepeatability
dc.subjectSpeed
dc.titleTime class for racing performance of the Quarter Horse: Genetic parameters and trends using Bayesian and multivariate threshold modelsen
dc.typeArtigo
unesp.author.orcid0000-0002-4717-0563[1]

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