Data/hora: 04/06/2024 02:28:48

Provedor de dados: | 64
País: | Brazil
Título: | REPRODUCTIVE TRAITS SELECTION IN NELORE BEEF CATTLE
Autores: | Moreira,Heverton Luis; Buzanskas,Marcos Eli; Munari,Danisio Prado; Canova,Érika Breda; Lôbo,Raysildo Barbosa; Paz,Claudia Cristina Paro de.
Data: | 2015-08-01
Ano: | 2015
Palavras-chave: | Reproductive efficiency; Genetic evaluation; Precocity.
Resumo: | Genetic breeding programs of beef cattle in Brazil are including new features, mainly related to reproductive efficiency.Thus, it is necessary to study the effectiveness of selection and quantify genetic gain for these traits in herds. This study estimated genetic and phenotypic parameters and genetic trends for reproductive traits used in breeding programs for Nelore beef cattle. The traits studied were the scrotal circumference (SC) at 365 and 450 days of age (SC365 and SC450), age at first calving (AFC) and gestation length, as a cow trait (GLcow) and a calf trait (GLcalf). The (co)variance components were obtained with the Restricted Maximum Likelihood Methodology in a single and double-trait analysis of the animal model. For scrotal circumference (SC365 and SC450), positive and favorable genetic gains were observed. For AFC, GLcow and GLcalf, the trends were favorable for selection, but without significant genetic gain. Selection for large SC may reduce AFC and improve female reproductive efficiency. The selection for reproductive traits (SC365, SC450, AFC and GL) may improve reproductive and productive efficiency of Nelore cattle, if used as a selection criterion.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542015000400355
Editor: | Editora da Universidade Federal de Lavras
Relação: | 10.1590/S1413-70542015000400006
Formato: | text/html
Fonte: | Ciência e Agrotecnologia  v.39 n.4 2015
Fonte: | info:eu-repo/semantics/openAccess