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History of registered Gyr breed in Brazilian Northeast: population structure and genetic improvement of growth traits Ciência Rural
Malhado,Carlos Henrique Mendes; Carneiro,Paulo Luiz Souza; Malhado,Ana Claudia Mendes; Martins,Jorge André Matias; Martins Filho,Raimundo; Bozzi,Riccardo.
This paper provides an evaluation of the population structure, phenotype and genetic trends of registered Gyr herd cattle in northeast Brazil. The study provides important baseline information for the management, conservation and potential population expansion of this economically and culturally important cattle breed. Pedigree data were analyzed for individuals born between 1964 and 2006. Body weight values were adjusted to 205 and 365 days of age for animals born between 1978 and 2006. Phenotypic change of zebu Gyr in northeast Brazil is solely due to environmental improvement. However, there is potential for artificial selection for weight gain in young cattle. Effective population size decreased during the 1990s and the average inbreeding coefficient...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Effective size of the population; Generation interval; Genetic trend; Inbreeding.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782010000600023
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