| Registro completo |
| Provedor de dados: |
R. Bras. Zootec.
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| País: |
Brazil
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| Título: |
Inbreeding on productive and reproductive traits of dairy Gyr cattle
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| Autores: |
Reis Filho,João Cruz
Verneque,Rui da Silva
Torres,Robledo de Almeida
Lopes,Paulo Sávio
Raidan,Fernanda Santos Silva
Toral,Fabio Luiz Buranelo
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| Data: |
2015-05-01
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| Ano: |
2015
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| Palavras-chave: |
Dairy cattle
Genetic parameter
Heritability
Inbreeding depression
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| Resumo: |
The objective of this study was to estimate genetic parameters and to evaluate the effects of inbreeding on productive and reproductive traits of dairy Gyr cattle. Single-trait animal models were used to estimate genetic parameters and solutions for inbreeding coefficients for milk (milk 305-d), fat (fat 305-d), protein (protein 305-d), lactose (lactose 305-d), and total solids (TS 305-d) yield up to 305 days of lactation, days in milk (DIM), age at first calving (AFC) and calving intervals (CI). The mean inbreeding coefficient was 2.82%. The models with linear and quadratic effects of inbreeding coefficients fitted the data better than the models without or with only linear effect of inbreeding coefficient for all traits. The increase in inbreeding coefficient caused several losses in productive and reproductive traits of dairy Gyr cattle. Estimates of heritability for milk 305-d, fat 305-d, protein 305-d, lactose 305-d, TS 305-d, DIM, AFC, and CI were 0.28, 0.27, 0.22, 0.21, 0.22, 0.17, 0.20, and 0.10, respectively. It is possible to achieve genetic progress in productive traits (especially in milk 305-d and fat 305-d) and age at first calving in dairy Gyr cattle through selection.
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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=S1516-35982015000500174
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| Editor: |
Sociedade Brasileira de Zootecnia
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| Relação: |
10.1590/S1806-92902015000500002
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| Formato: |
text/html
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| Fonte: |
Revista Brasileira de Zootecnia v.44 n.5 2015
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| Direitos: |
info:eu-repo/semantics/openAccess
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