| Registro completo |
| Provedor de dados: |
Ciência Rural
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| País: |
Brazil
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| Título: |
History of registered Gyr breed in Brazilian Northeast: population structure and genetic improvement of growth traits
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| Autores: |
Malhado,Carlos Henrique Mendes
Carneiro,Paulo Luiz Souza
Malhado,Ana Claudia Mendes
Martins,Jorge André Matias
Martins Filho,Raimundo
Bozzi,Riccardo
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| Data: |
2010-06-01
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| Ano: |
2010
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| Palavras-chave: |
Effective size of the population
Generation interval
Genetic trend
Inbreeding
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| Resumo: |
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 increased during the studied period. An increase of the effective population size of Gyr in northeast Brazil is strongly recommended, along with an increase in the management of the mating process to prevent inbreeding and to maintain the genetic variability of the breed.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782010000600023
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| Editor: |
Universidade Federal de Santa Maria
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| Relação: |
10.1590/S0103-84782010000600023
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| Formato: |
text/html
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| Fonte: |
Ciência Rural v.40 n.6 2010
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| Direitos: |
info:eu-repo/semantics/openAccess
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