| Registro completo |
| Provedor de dados: |
Animal Sciences
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| País: |
Brazil
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| Título: |
Genetic improvement of Nellore cattle in the semi-arid region of northeastern Brazil
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| Autores: |
Barbosa, Ana Carla Borges
Oliveira, Iomar Ramos
Malhado, Ana Claudia Mendes
Carneiro, Paulo Luiz Sousa
Martins Filho, Raimundo
Malhado, Carlos Henrique Mendes
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| Data: |
2015-08-31
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| Ano: |
2015
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| Palavras-chave: |
Genética e Melhoramento Animal age at first calving
Genetic progress
Genetic parameters
Heritability.
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| Resumo: |
The semi-arid region of Brazil represents approximately 57% of the northeastern territory. The main economic activity in this region is agriculture and livestock, in most cases, using traditional technologies. However, there is little published information currently available on cattle-raising in this part of Brazil. The objective of this study was to estimate genetic parameters and trends for productive and reproductive traits of Nellore cattle raised in semi-arid region of northeastern Brazil. Data were collected on weight-adjusted at 205 (W205), 365 (W365) and 550 (W550) days of life, age at first calving (AFC), calving interval (CI) and scrotal circumference (SC) at 550 days of life of cattle born between 1965 and 2011. Estimates of covariance and variance were obtained through univariate analysis using a Gibbs sampler. The estimated coefficients of heritability (mode) were 0.27 (W205), 0.36 (W365) and 0.39 (W550), 0.37 (SC), 0.22 (AFC) and 0.03 (CI). Little or no gain from selection is apparent in the genetic trend analysis over the 45 years of the study. However, environmental improvement has allowed phenotypic progress in growth traits and age at first age calving.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/28094
10.4025/actascianimsci.v37i4.28094
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| Editor: |
Editora da Universidade Estadual de Maringá
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| Relação: |
http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/28094/pdf_122
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| Formato: |
application/pdf
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| Fonte: |
Acta Scientiarum. Animal Sciences; v. 37, n. 4 (2015); 429-435
Acta Scientiarum. Animal Sciences; v. 37, n. 4 (2015); 429-435
1807-8672
1806-2636
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