Estimation of genetic parameters of test day fat and protein yields in Brazilian Holstein cattle using an autoregressive multiple lactation animal model.
This study was aimed to estimate variance components and genetic parameters for daily fat and protein yields of Brazilian Holstein cattle, using an autoregressive test day multiple lactations (AR) animal model. Data consisted of test day (TD) records produced by Holstein cows under milk recording supervised by the Brazilian Holstein Association, calving from 1993 to 2004. Medium to high heritability estimates (from 0.18 to 0.30 and from 0.30 to 0.43 for fat and protein TD yields, respectively) suggest opportunities for larger genetic gain by selection. Results from this study confirm the potential of using TD yields to replace the lactation model to estimate breeding values of Holstein cows in Brazil. Further studies are needed to compare these results with other modelling approaches e.g., the RR model.
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Format: | Artigo de periódico biblioteca |
Language: | Ingles English |
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2011-03-18
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Subjects: | Milk components, Selection, Test-day model, Variance components, dairy cattle, |
Online Access: | http://www.alice.cnptia.embrapa.br/alice/handle/doc/881486 |
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dig-alice-doc-8814862024-02-15T14:32:34Z Estimation of genetic parameters of test day fat and protein yields in Brazilian Holstein cattle using an autoregressive multiple lactation animal model. COSTA, C. N. CARVALHEIRA, J. COBUCI, J. A. FREITAS, A. F. de THOMPSON, G. CLAUDIO NAPOLIS COSTA, CNPGL; J. CARVALHEIRA, UNIVERSITY OF PORTO, PORTUGAL; JAIME ARAÚJO COBUCI, UFRS; ARY FERREIRA DE FREITAS, Pesquisador aposentado do CNPGL; G. THOMPSON, UNIVERSITY OF PORTO, PORTUGAL. Milk components Selection Test-day model Variance components dairy cattle This study was aimed to estimate variance components and genetic parameters for daily fat and protein yields of Brazilian Holstein cattle, using an autoregressive test day multiple lactations (AR) animal model. Data consisted of test day (TD) records produced by Holstein cows under milk recording supervised by the Brazilian Holstein Association, calving from 1993 to 2004. Medium to high heritability estimates (from 0.18 to 0.30 and from 0.30 to 0.43 for fat and protein TD yields, respectively) suggest opportunities for larger genetic gain by selection. Results from this study confirm the potential of using TD yields to replace the lactation model to estimate breeding values of Holstein cows in Brazil. Further studies are needed to compare these results with other modelling approaches e.g., the RR model. 2024-02-15T14:32:34Z 2024-02-15T14:32:34Z 2011-03-18 2010 Artigo de periódico South African Journal of Animal Science, v. 39, n. 5, p. 165-168, 2010. http://www.alice.cnptia.embrapa.br/alice/handle/doc/881486 Ingles en openAccess |
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Milk components Selection Test-day model Variance components dairy cattle Milk components Selection Test-day model Variance components dairy cattle |
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Milk components Selection Test-day model Variance components dairy cattle Milk components Selection Test-day model Variance components dairy cattle COSTA, C. N. CARVALHEIRA, J. COBUCI, J. A. FREITAS, A. F. de THOMPSON, G. Estimation of genetic parameters of test day fat and protein yields in Brazilian Holstein cattle using an autoregressive multiple lactation animal model. |
description |
This study was aimed to estimate variance components and genetic parameters for daily fat and protein yields of Brazilian Holstein cattle, using an autoregressive test day multiple lactations (AR) animal model. Data consisted of test day (TD) records produced by Holstein cows under milk recording supervised by the Brazilian Holstein Association, calving from 1993 to 2004. Medium to high heritability estimates (from 0.18 to 0.30 and from 0.30 to 0.43 for fat and protein TD yields, respectively) suggest opportunities for larger genetic gain by selection. Results from this study confirm the potential of using TD yields to replace the lactation model to estimate breeding values of Holstein cows in Brazil. Further studies are needed to compare these results with other modelling approaches e.g., the RR model. |
author2 |
CLAUDIO NAPOLIS COSTA, CNPGL; J. CARVALHEIRA, UNIVERSITY OF PORTO, PORTUGAL; JAIME ARAÚJO COBUCI, UFRS; ARY FERREIRA DE FREITAS, Pesquisador aposentado do CNPGL; G. THOMPSON, UNIVERSITY OF PORTO, PORTUGAL. |
author_facet |
CLAUDIO NAPOLIS COSTA, CNPGL; J. CARVALHEIRA, UNIVERSITY OF PORTO, PORTUGAL; JAIME ARAÚJO COBUCI, UFRS; ARY FERREIRA DE FREITAS, Pesquisador aposentado do CNPGL; G. THOMPSON, UNIVERSITY OF PORTO, PORTUGAL. COSTA, C. N. CARVALHEIRA, J. COBUCI, J. A. FREITAS, A. F. de THOMPSON, G. |
format |
Artigo de periódico |
topic_facet |
Milk components Selection Test-day model Variance components dairy cattle |
author |
COSTA, C. N. CARVALHEIRA, J. COBUCI, J. A. FREITAS, A. F. de THOMPSON, G. |
author_sort |
COSTA, C. N. |
title |
Estimation of genetic parameters of test day fat and protein yields in Brazilian Holstein cattle using an autoregressive multiple lactation animal model. |
title_short |
Estimation of genetic parameters of test day fat and protein yields in Brazilian Holstein cattle using an autoregressive multiple lactation animal model. |
title_full |
Estimation of genetic parameters of test day fat and protein yields in Brazilian Holstein cattle using an autoregressive multiple lactation animal model. |
title_fullStr |
Estimation of genetic parameters of test day fat and protein yields in Brazilian Holstein cattle using an autoregressive multiple lactation animal model. |
title_full_unstemmed |
Estimation of genetic parameters of test day fat and protein yields in Brazilian Holstein cattle using an autoregressive multiple lactation animal model. |
title_sort |
estimation of genetic parameters of test day fat and protein yields in brazilian holstein cattle using an autoregressive multiple lactation animal model. |
publishDate |
2011-03-18 |
url |
http://www.alice.cnptia.embrapa.br/alice/handle/doc/881486 |
work_keys_str_mv |
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