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dc.contributor.authorAlmeida, Tatiana Prestes dept_BR
dc.contributor.authorKern, Elisandra Lurdespt_BR
dc.contributor.authorDaltro, Darlene dos Santospt_BR
dc.contributor.authorBraccini Neto, Josépt_BR
dc.contributor.authorPimentel, Concepta Margaret McManuspt_BR
dc.contributor.authorThaler Neto, Andrépt_BR
dc.contributor.authorCobuci, Jaime Araújopt_BR
dc.date.accessioned2017-09-05T02:32:53Zpt_BR
dc.date.issued2017pt_BR
dc.identifier.issn1516-3598pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/166170pt_BR
dc.description.abstractThis study aimed to estimate heritability, genetic, and residual correlations between reproductive traits such as age at first calving, calving interval, dry period, and first service period and linear type traits measured in Holstein cows born between the years 1990 and 2008 in Brazil. The (co)variance components were estimated by restricted maximum likelihood, using the MTDFREML software. The heritability for reproductive traits and linear-type traits ranged from 0.02 to 0.03 and from 0.07 to 0.40, respectively. Estimates of genetic correlations between reproductive and linear-type traits ranged from –0.23 (top line) to 0.28 (angularity) to age at first calving, from –0.54 (final score) to 0.34 (foot angle) to calving interval, from –0.23 (angularity) to 0.56 (stature) to dry period, and from –0.52 (final score) to 0.36 (height udder) to first service period. Direct selection for any of the reproductive traits implies low genetic gains by virtue of their low heritabilities. Among the linear-type traits, the final score, chest width, top line, angularity, teat length, udder attachment, rear teat placement were highlighted as good auxiliary traits to improve reproductive efficiency of Holstein cows in Brazil. The simultaneous selection for reproductive and linear-type traits can lead a higher genetic progress in the reproductive traits.en
dc.format.mimetypeapplication/pdfpt_BR
dc.language.isoporpt_BR
dc.relation.ispartofRevista brasileira de zootecnia= Brazilian journal of animal science. Viçosa, MG. Vol. 46, n. 2 (fev. 2017), p. 91-98pt_BR
dc.rightsOpen Accessen
dc.subjectGenética animalpt_BR
dc.subjectAge at first calvingen
dc.subjectReprodução animalpt_BR
dc.subjectDairy cattleen
dc.subjectGenetic parametersen
dc.subjectReproductive efficiencyen
dc.titleGenetic associations between reproductive and linear-type traits of Holstein cows in Brazilpt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb001027044pt_BR
dc.type.originNacionalpt_BR


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