Effect of age at first conception as a selection criterion on growth and carcass traits in Nellore cattle

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorEmpresa Brasileira de Pesquisa Agropecuária (EMBRAPA)-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorAssociação Nacional de Criadores e Pesquisadores-
Autor(es): dc.contributorCobb-Vantress-
Autor(es): dc.creatorBrunes, Ludmilla Costa-
Autor(es): dc.creatorBaldi, Fernando-
Autor(es): dc.creatore Costa, Marcos Fernando Oliveira-
Autor(es): dc.creatorLobo, Raysildo Barbosa-
Autor(es): dc.creatorLopes, Fernando Brito-
Autor(es): dc.creatorMagnabosco, Cláudio Ulhoa-
Data de aceite: dc.date.accessioned2025-08-21T21:24:08Z-
Data de disponibilização: dc.date.available2025-08-21T21:24:08Z-
Data de envio: dc.date.issued2025-04-29-
Data de envio: dc.date.issued2023-12-31-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1590/1809-6891v25e-75632E-
Fonte completa do material: dc.identifierhttps://hdl.handle.net/11449/306045-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/306045-
Descrição: dc.descriptionThe aim was to identify predictive traits of relatively easy measurement and which can be recorded early in life (age at first conception - AFCo), besides estimating its genetic correlations with growth and carcass traits in Nellore cattle. Age at first conception was considered the age at which the female had the first positive diagnosis for pregnancy. The estimation of (co)variance components and genetic parameters was performed using a linear animal model in two-trait analysis. The estimates of heritability were moderate, enabling genetic selection for growth-, carcass-, and sexual precocityrelated traits. The genetic correlation obtained between AFCo and age at first calving (AFCa) was high (0.88), indicating the feasibility of using AFCo as a selection criterion for early calving heifers. Genetic correlation estimates between AFCo and AFCa with weight at 120, 210, 365, and 450 days of age and carcass traits were moderate and negative (-0.33 to -0.62). Thus, genetic selection for animals with early AFCo and AFCa would enhance carcass yield, fat deposition, and growth performance, despite not affecting birth weight or daily weight gain. The results of this study encourage the use of AFCo in Nellore cattle since this trait displayed enough genetic variability in Nellore cattle, and can be used as selection criteria to improve sexual precocity. When the objective of genetic selection is to increase heifer sexual precocity, we could use the first trait as a criterion, as the measurement of this trait occurs at a lower AFCa.-
Descrição: dc.descriptionEmpresa Brasileira de Pesquisa Agropecuária (Embrapa Cerrados), Distrito Federal-
Descrição: dc.descriptionUniversidade Estadual Paulista Júlio Mesquita Filho (UNESP), São Paulo-
Descrição: dc.descriptionAssociação Nacional de Criadores e Pesquisadores, São Paulo-
Descrição: dc.descriptionCobb-Vantress-
Descrição: dc.descriptionUniversidade Estadual Paulista Júlio Mesquita Filho (UNESP), São Paulo-
Idioma: dc.languageen-
Relação: dc.relationCiencia Animal Brasileira-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectBos indicus-
Palavras-chave: dc.subjectcarcass quality-
Palavras-chave: dc.subjectgenetic parameters-
Palavras-chave: dc.subjectproductive traits-
Palavras-chave: dc.subjectsexual precocity-
Título: dc.titleEffect of age at first conception as a selection criterion on growth and carcass traits in Nellore cattle-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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