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dc.contributor.authorClaus, Luis Afonso Marquespt_BR
dc.contributor.authorKoetz Junior, Celsopt_BR
dc.contributor.authorRoso, Vanerlei Mozaquatropt_BR
dc.contributor.authorBorges, Marcelo Henrique Favaropt_BR
dc.contributor.authorBarcellos, Julio Otavio Jardimpt_BR
dc.contributor.authorRibeiro, Edson Luis de Azambujapt_BR
dc.date.accessioned2017-09-05T02:32:50Zpt_BR
dc.date.issued2017pt_BR
dc.identifier.issn1516-3598pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/166166pt_BR
dc.description.abstractThis study aimed at estimating the heritability of age at first calving and of performance traits included in the selection index and the genetic correlations between age at first calving and these performance traits. Data were extracted from the Conexão Delta G database and only data from herds in which heifers were bred younger than 24 months of age were used, resulting in a file with 331,310 evaluated animals. The following traits were included in the analyses: age at first calving, birth to weaning gain, post-weaning weight gain, visual scores of conformation, precocity, and muscling evaluated at weaning and in yearling heifers. Covariance components were obtained by bi-character analyses between traits. An alternative age at first calving was also taken into account, in which all heifers were used, including those that were mated and did not calve. Covariance components and estimates of the effects included in the model were obtained using the software program DMU. Heritability estimates were 0.11 and 0.13 for age at first calving and alternative age at first calving, 0.38 for birth to weaning gain, and 0.13 for post-weaning weight gain. Visual score estimates ranged between 0.16 and 0.18 at weaning and 0.19 and 0.29 in yearlings. Genetic correlation estimates of the traits were low, but in the desirable direction. Selection for birth to weaning gain and visual scores does not have a negative effect on age at first calving or alternative age at first calving.en
dc.format.mimetypeapplication/pdf
dc.language.isoengpt_BR
dc.relation.ispartofRevista brasileira de zootecnia= Brazilian journal of animal science [recurso eletrônico]. Viçosa, MG. Vol. 46, n.4 (abr. 2017), p. 303-308pt_BR
dc.rightsOpen Accessen
dc.subjectNovilhopt_BR
dc.subjectBeef cattleen
dc.subjectGanho de pesopt_BR
dc.subjectBreedingen
dc.subjectHeritabilityen
dc.subjectParâmetro genéticopt_BR
dc.subjectGado nelorept_BR
dc.titleGenetic parameters of age at first calving, weight gain, and visual scores in Nelore heiferspt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb001044319pt_BR
dc.type.originNacionalpt_BR


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