Evaluation of mature cow weight: Genetic correlations with traits used in selection indices, correlated responses, and genetic trends in Nelore cattle

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorBoligon, A. A.
dc.creatorCarvalheiro, R.
dc.creatorAlbuquerque, L. G.
dc.date2014-05-27T11:27:32Z
dc.date2016-10-25T18:41:37Z
dc.date2014-05-27T11:27:32Z
dc.date2016-10-25T18:41:37Z
dc.date2013-01-01
dc.date.accessioned2017-04-06T02:08:13Z
dc.date.available2017-04-06T02:08:13Z
dc.identifierJournal of Animal Science, v. 91, n. 1, p. 20-28, 2013.
dc.identifier0021-8812
dc.identifier1525-3163
dc.identifierhttp://hdl.handle.net/11449/74284
dc.identifierhttp://acervodigital.unesp.br/handle/11449/74284
dc.identifier10.2527/jas.2012-5346
dc.identifierWOS:000319673900003
dc.identifier2-s2.0-84882713827
dc.identifierhttp://dx.doi.org/10.2527/jas.2012-5346
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/895052
dc.descriptionGenetic correlations of selection indices and the traits considered in these indices with mature weight (MW) of Nelore females and correlated responses were estimated to determine whether current selection practices will result in an undesired correlated response in MW. Genetic trends for weaning and yearling indices and MW were also estimated. Data from 612,244 Nelore animals born between 1984 and 2010, belonging to different beef cattle evaluation programs from Brazil and Paraguay, were used. The following traits were studied: weaning conformation (WC), weaning precocity (WP), weaning muscling (WM), yearling conformation (YC), yearling precocity (YP), yearling muscling (YM), weaning and yearling indices, BW gain from birth to weaning (BWG), postweaning BW gain (PWG), scrotal circumference (SC), and MW. The variance and covariance components were estimated by Bayesian inference in a multitrait analysis, including all traits in the same analysis, using a nonlinear (threshold) animal model for visual scores and a linear animal model for the other traits. The mean direct heritabilities were 0.21 ± 0.007 (WC), 0.22 ± 0.007 (WP), 0.20 ± 0.007 (WM), 0.43 ± 0.005 (YC), 0.40 ± 0.005 (YP), 0.40 ± 0.005 (YM), 0.17 ± 0.003 (BWG), 0.21 ± 0.004 (PWG), 0.32 ± 0.001 (SC), and 0.44 ± 0.018 (MW). The genetic correlations between MW and weaning and yearling indices were positive and of medium magnitude (0.30 ± 0.01 and 0.31 ± 0.01, respectively). The genetic changes in weaning index, yearling index, and MW, expressed as units of genetic SD per year, were 0.26, 0.27, and 0.01, respectively. The genetic trend for MW was nonsignificant, suggesting no negative correlated response. The selection practice based on the use of sires with high final index giving preference for those better ranked for yearling precocity and muscling than for conformation generates only a minimal correlated response in MW. © 2013 American Society of Animal Science. All rights reserved.
dc.languageeng
dc.relationJournal of Animal Science
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectBayesian inference
dc.subjectBeef cattle
dc.subjectBody weight gain
dc.subjectScrotal circumference
dc.subjectVisual scores
dc.subjectaging
dc.subjectanimal
dc.subjectcattle
dc.subjectfemale
dc.subjectgenetic selection
dc.subjectgenetics
dc.subjectgrowth, development and aging
dc.subjectmale
dc.subjectAging
dc.subjectAnimals
dc.subjectCattle
dc.subjectFemale
dc.subjectMale
dc.subjectSelection, Genetic
dc.titleEvaluation of mature cow weight: Genetic correlations with traits used in selection indices, correlated responses, and genetic trends in Nelore cattle
dc.typeOtro


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