Genetic association between body composition measured by ultrasound and visual scores in Brazilian Nelore cattle

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dc.contributor.authorGordo, D. G. M. [UNESP]
dc.contributor.authorBaldi, Fernando [UNESP]
dc.contributor.authorLobo, R. B.
dc.contributor.authorKoury Filho, W.
dc.contributor.authorSainz, R. D.
dc.contributor.authorAlbuquerque, Lucia Galvão de [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionAssoc Nacl Criadores & Pesquisadores
dc.contributor.institutionBrasilcomz Zootecnia Trop
dc.contributor.institutionUniv Calif Davis
dc.date.accessioned2014-05-20T13:18:38Z
dc.date.available2014-05-20T13:18:38Z
dc.date.issued2012-12-01
dc.description.abstractThe objective of this study was to evaluate the genetic variability of body composition traits measured by ultrasound, growth traits, and visual scores as well as their genetic associations in Nelore cattle. A total of 9,765, 13,285, 13,061, 12,811, 3,484, 3,484, 3,483, and 3,303 records of weight at time of ultrasound measure (W550), 12th-13th rib LM area (LMA), backfat thickness (BF), rump fat thickness (RF), visual scores for body structure (BS), finishing precocity (FP), muscling (MS), and sheath and navel characteristics (SN), respectively, were used. The model included contemporary group (defined as year and season of birth, sex, and management group) as a fixed effect and age of dam at calving and age of the animal (linear and quadratic effects) as covariates. The direct additive genetic effect was included as a random effect. The analyses also included 46,157 observations of BW adjusted to 120 d. The (co)variance components were estimated by the restricted maximum likelihood method using a multitrait animal model. Heritability estimates for W550, LMA, BF, RF, BS, FP, MS, and SN were 0.37 +/- 0.030, 0.33 +/- 0.03, 0.24 +/- 0.02, 0.28 +/- 0.03, 0.24 +/- 0.04, 0.38 +/- 0.05, 0.29 +/- 0.05, and 0.38 +/- 0.06, respectively. The estimated genetic correlations between visual scores and LMA were moderate and positive, ranging from 0.37 to 0.44. Similar results were obtained for the estimated genetic correlations between FP and MS with fat thickness measures (BF and RF). Low genetic correlations were estimated between SN and BS and between SN and the body composition traits, indicating that selection for body composition traits and BS will not affect sheath and navel size. The estimated genetic correlations between weight adjusted to 120 d of age (W120) and W550 and BS were high (0.87 and 0.91) and moderate with LMA (0.49 and 0.55), FP (0.37 and 0.41), and MS (0.47 and 0.55). The visual scores and ultrasound-measured body composition traits have enough genetic variation for selection purposes in Nelore cattle. Selection based on visual scores for body structure, finishing precocity and muscling should lead to desired changes in body composition albeit much more slowly than direct selection on those traits measured by ultrasound. Selection for heavier BW at early ages should lead to favorable changes in yearling LM area and visual scores.en
dc.description.affiliationUniv Estadual Paulista, Fac Ciencias Agr & Vet, BR-14884900 São Paulo, Brazil
dc.description.affiliationAssoc Nacl Criadores & Pesquisadores, BR-14020230 São Paulo, Brazil
dc.description.affiliationBrasilcomz Zootecnia Trop, BR-14870260 São Paulo, Brazil
dc.description.affiliationUniv Calif Davis, Dept Anim Sci, Davis, CA 95616 USA
dc.description.affiliationUnespUniv Estadual Paulista, Fac Ciencias Agr & Vet, BR-14884900 São Paulo, Brazil
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.format.extent4223-4229
dc.identifierhttp://dx.doi.org/10.2527/jas2011-3935
dc.identifier.citationJournal of Animal Science. Champaign: Amer Soc Animal Science, v. 90, n. 12, p. 4223-4229, 2012.
dc.identifier.doi10.2527/jas2011-3935
dc.identifier.issn0021-8812
dc.identifier.lattes5866981114947883
dc.identifier.urihttp://hdl.handle.net/11449/4651
dc.identifier.wosWOS:000312738400008
dc.language.isoeng
dc.publisherAmer Soc Animal Science
dc.relation.ispartofJournal of Animal Science
dc.relation.ispartofjcr1.711
dc.relation.ispartofsjr0,848
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectBeef cattleen
dc.subjectFat thicknessen
dc.subjectGenetic correlationen
dc.subjectHeritabilityen
dc.subjectLongissimus muscle areaen
dc.subjectvisual evaluationen
dc.titleGenetic association between body composition measured by ultrasound and visual scores in Brazilian Nelore cattleen
dc.typeArtigo
dcterms.licensehttp://journalofanimalscience.org/site/misc/ifora.xhtml
dcterms.rightsHolderAmer Soc Animal Science
unesp.author.lattes5866981114947883
unesp.author.orcid0000-0002-2030-7590[6]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Ciências Agrárias e Veterinárias, Jaboticabalpt

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