Genetic associations among average annual productivity, growth traits, and stayability: A parallel between Nelore and composite beef cattle

dc.contributor.authorSantana, M. L.
dc.contributor.authorEler, J. P.
dc.contributor.authorBignardi, A. B. [UNESP]
dc.contributor.authorFerraz, J. B S
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-27T11:29:38Z
dc.date.available2014-05-27T11:29:38Z
dc.date.issued2013-06-01
dc.description.abstractThis study was conducted to examine the relationship among average annual productivity of the cow (PRODAM), yearling weight (YW), postweaning BW gain (PWG), scrotal circumference (SC), and stayability in the herd for at least 6 yr (STAY) of Nelore and composite beef cattle. Measurements were taken on animals born between 1980 and 2010 on 70 farms located in 7 Brazilian states. Estimates of heritability and genetic and environmental correlations were obtained by Bayesian approach with 5-trait animal models. Genetic trends were estimated by regressing means of estimated breeding values by year of birth. The heritability estimates were between 0.14 and 0.47. Estimates of genetic correlation among female traits (PRODAM and STAY) and growth traits ranged from-0.02 to 0.30. Estimates of genetic correlations ranged from 0.23 to 0.94 among growth traits indicating that selection for these traits could be successful in tropical breeding programs. Genetic correlations among all traits were favorable and simultaneous selection for growth, productivity, and stayability is therefore possible. Genetic correlation between PRODAM and STAY was 0.99 and 0.85 for Nelore and composite cattle, respectively. Therefore, PRODAM and STAY might be influenced by many of the same genes. The inclusion of PRODAM instead of STAY as a selection criterion seems to be more advantageous for tropical breeding programs because the generation interval required to obtain accurate estimates of genetic merit for PRODAM is shorter. Average annual genetic changes were greater in Nelore than in composite cattle. This was not unexpected because the breeding program of composite cattle included a large number of farms, different production environments, and genetic level of the herds and breeds. Thus, the selection process has become more difficult in this population. © 2013 American Society of Animal Science. All rights reserved.en
dc.description.affiliationGrupo de Melhoramento Animal e Biotecnologia (GMAB) Departamento de Medicina Veterinária Universidade de São Paulo, C. Postal 23, CEP 13635-970, Pirassununga, SP
dc.description.affiliationUniversidade Estadual Paulista Júlio de Mesquita Filho, CEP 14884-900, Jaboticabal, SP
dc.description.affiliationUnespUniversidade Estadual Paulista Júlio de Mesquita Filho, CEP 14884-900, Jaboticabal, SP
dc.format.extent2566-2574
dc.identifierhttp://dx.doi.org/10.2527/jas.2012-5856
dc.identifier.citationJournal of Animal Science, v. 91, n. 6, p. 2566-2574, 2013.
dc.identifier.doi10.2527/jas.2012-5856
dc.identifier.issn0021-8812
dc.identifier.issn1525-3163
dc.identifier.scopus2-s2.0-84882704931
dc.identifier.urihttp://hdl.handle.net/11449/75585
dc.identifier.wosWOS:000319701200011
dc.language.isoeng
dc.relation.ispartofJournal of Animal Science
dc.relation.ispartofjcr1.711
dc.relation.ispartofsjr0,848
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subjectBeef cattle
dc.subjectCorrelation
dc.subjectGenetic trend
dc.subjectLongevity
dc.subjectThreshold model
dc.subjectTropical breeding program
dc.titleGenetic associations among average annual productivity, growth traits, and stayability: A parallel between Nelore and composite beef cattleen
dc.typeArtigo
dcterms.licensehttp://journalofanimalscience.org/site/misc/ifora.xhtml

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