Selection for higher body weight in Nelore cattle is effective in achieving an increase of longissimus muscle area without reducing subcutaneous fat thickness

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dc.contributor.authorPinheiro, Tiago Roque
dc.contributor.authorMercadante, Maria Eugênia Zerlotti
dc.contributor.authorAlbuquerque, Lucia Galvão de
dc.contributor.authorBonilha, Sarah Figueiredo Martins
dc.contributor.authorMonteiro, Fábio Morato
dc.date.accessioned2024-05-21T01:16:47Z
dc.date.available2024-05-21T01:16:47Z
dc.date.issued2012
dc.description.abstractThe objectives of this study were to estimate heritabilities and genetic and phenotypic correlations between carcass traits measured by ultrasound and other economically important traits generally used as selection criteria in beef cattle and to estimate the genetic changes in the carcass traits as a result of selection for post-yearling weight. Carcass traits measured by ultrasound at two ages (12 and 18 months) and the correlation of these traits with weight, hip height and body condition score of males (yearling) and females (post-yearling) were analyzed. Multi-trait analysis was performed using the restricted maximum likelihood method under an animal model. To demonstrate the effect of selection for growth, phenotypic and expected breeding value means of the carcass traits and weights according to selection line (Nellore control line, selection line and traditional line) were estimated using records from animals born in the last 3 years (2006 to 2008). The heritability estimates were high for longissimus muscle area (LMA) at 12 and 18 months of age (0.47 and 0.40, respectively). For fat thickness measures, heritabilities ranged from 0.37 to 0.29. Genetic correlations of the same trait between the two ages were high for LMA (0.95). The Nellore breed shows medium to high genetic variability in carcass traits measured by ultrasound at 12 and 18 months of age, and a greater response is expected if selection for backfat thickness is performed at about 12 months of age. Selection for higher body weight will lead to an increase of LMA at the two ages without reducing subcutaneous fat thickness.
dc.identifier.issn1516-3598
dc.identifier.otherS1516-35982012000600016-scl
dc.identifier.urihttps://repositorio-aptaregional.agricultura.sp.gov.br/handle/123456789/2374
dc.relation.ispartofRevista Brasileira de Zootecnia
dc.subjectcarcass traits
dc.subjectcorrelated responses
dc.subjectgenetic correlation
dc.subjectultrasound
dc.subjectZebu cattle
dc.titleSelection for higher body weight in Nelore cattle is effective in achieving an increase of longissimus muscle area without reducing subcutaneous fat thickness
dc.typeArtigos
oaire.citation.endPage1432
oaire.citation.issue6
oaire.citation.startPage1426
oaire.citation.volume41

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