Genetic evaluation for persistency of lactation in Holstein cows using a random regression model.
Autor(a) principal: | |
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Data de Publicação: | 2007 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) |
Texto Completo: | http://www.alice.cnptia.embrapa.br/alice/handle/doc/595956 https://doi.org/10.1590/S1415-47572007000300009 |
Resumo: | A model for analyzing test day records including both fixed and random coefficients was applied to the genetic evaluation of first lactation data for Holstein cows. Data comprising 87045 test-day milk yield records from calving between 1997 and 2001 from Holstein herds in 10 regions of the Brazilian state of Minas Gerais. Six persistency of lactation measures were evaluated using breeding values obtained by random regression analyses. The Wilmink function was used to model the additive genetic and permanent environmental effects. Residual variance was constant throughout lactation. Ranking for animals did not change among criteria for persistency measurements, but ranking changes were observed when the estimated breeding value (EBV) for persistency of lactation was contrasted with those estimated for 305-day milk yield (305MY). The rank correlation estimates for persistency of lactation and 305MY were practically the same for sire and cows, and ranged from -0.45 to 0.69. The EBVs for milk yield during lactation for sires producing daughters with superior 305MY indicate genetic differences between sires regarding their ability to transmit desirable persistency of lactation traits. This suggests that selection for total lactation milk yield does not identify sires or cows that are genetically superior in regard to persistency of lactation. Genetic evaluation for persistency of lactation is important for improving the efficiency of the milk production capacity of Holstein cows. |
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Genetic evaluation for persistency of lactation in Holstein cows using a random regression model.Genetic evaluationpersistency of lactationrank correlationrandom regression modelsA model for analyzing test day records including both fixed and random coefficients was applied to the genetic evaluation of first lactation data for Holstein cows. Data comprising 87045 test-day milk yield records from calving between 1997 and 2001 from Holstein herds in 10 regions of the Brazilian state of Minas Gerais. Six persistency of lactation measures were evaluated using breeding values obtained by random regression analyses. The Wilmink function was used to model the additive genetic and permanent environmental effects. Residual variance was constant throughout lactation. Ranking for animals did not change among criteria for persistency measurements, but ranking changes were observed when the estimated breeding value (EBV) for persistency of lactation was contrasted with those estimated for 305-day milk yield (305MY). The rank correlation estimates for persistency of lactation and 305MY were practically the same for sire and cows, and ranged from -0.45 to 0.69. The EBVs for milk yield during lactation for sires producing daughters with superior 305MY indicate genetic differences between sires regarding their ability to transmit desirable persistency of lactation traits. This suggests that selection for total lactation milk yield does not identify sires or cows that are genetically superior in regard to persistency of lactation. Genetic evaluation for persistency of lactation is important for improving the efficiency of the milk production capacity of Holstein cows.Jaime Araújo Cobuci, UFRGS; Ricardo Frederico Euclydes, UFV; Cláudio Napolis Costa, Embrapa Gado de Leite; Robledo de Almeida Torres, UFV; Paulo Sávio Lopes, UFV; Carmem Silva Pereira, UFV.COBUCI, J. A.EUCLYDES, R. F.COSTA, C. N.TORRES, R. de A.LOPES, P. S.PEREIRA, C. S.2022-09-29T20:05:52Z2022-09-29T20:05:52Z2007-10-102007info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleGenetics and Molecular Biology, Ribeirão Preto, v. 30, n. 2, p. 349-355, 2007.http://www.alice.cnptia.embrapa.br/alice/handle/doc/595956https://doi.org/10.1590/S1415-47572007000300009enginfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPA2022-09-29T20:05:59Zoai:www.alice.cnptia.embrapa.br:doc/595956Repositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestopendoar:21542022-09-29T20:05:59falseRepositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestcg-riaa@embrapa.bropendoar:21542022-09-29T20:05:59Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false |
dc.title.none.fl_str_mv |
Genetic evaluation for persistency of lactation in Holstein cows using a random regression model. |
title |
Genetic evaluation for persistency of lactation in Holstein cows using a random regression model. |
spellingShingle |
Genetic evaluation for persistency of lactation in Holstein cows using a random regression model. COBUCI, J. A. Genetic evaluation persistency of lactation rank correlation random regression models |
title_short |
Genetic evaluation for persistency of lactation in Holstein cows using a random regression model. |
title_full |
Genetic evaluation for persistency of lactation in Holstein cows using a random regression model. |
title_fullStr |
Genetic evaluation for persistency of lactation in Holstein cows using a random regression model. |
title_full_unstemmed |
Genetic evaluation for persistency of lactation in Holstein cows using a random regression model. |
title_sort |
Genetic evaluation for persistency of lactation in Holstein cows using a random regression model. |
author |
COBUCI, J. A. |
author_facet |
COBUCI, J. A. EUCLYDES, R. F. COSTA, C. N. TORRES, R. de A. LOPES, P. S. PEREIRA, C. S. |
author_role |
author |
author2 |
EUCLYDES, R. F. COSTA, C. N. TORRES, R. de A. LOPES, P. S. PEREIRA, C. S. |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
Jaime Araújo Cobuci, UFRGS; Ricardo Frederico Euclydes, UFV; Cláudio Napolis Costa, Embrapa Gado de Leite; Robledo de Almeida Torres, UFV; Paulo Sávio Lopes, UFV; Carmem Silva Pereira, UFV. |
dc.contributor.author.fl_str_mv |
COBUCI, J. A. EUCLYDES, R. F. COSTA, C. N. TORRES, R. de A. LOPES, P. S. PEREIRA, C. S. |
dc.subject.por.fl_str_mv |
Genetic evaluation persistency of lactation rank correlation random regression models |
topic |
Genetic evaluation persistency of lactation rank correlation random regression models |
description |
A model for analyzing test day records including both fixed and random coefficients was applied to the genetic evaluation of first lactation data for Holstein cows. Data comprising 87045 test-day milk yield records from calving between 1997 and 2001 from Holstein herds in 10 regions of the Brazilian state of Minas Gerais. Six persistency of lactation measures were evaluated using breeding values obtained by random regression analyses. The Wilmink function was used to model the additive genetic and permanent environmental effects. Residual variance was constant throughout lactation. Ranking for animals did not change among criteria for persistency measurements, but ranking changes were observed when the estimated breeding value (EBV) for persistency of lactation was contrasted with those estimated for 305-day milk yield (305MY). The rank correlation estimates for persistency of lactation and 305MY were practically the same for sire and cows, and ranged from -0.45 to 0.69. The EBVs for milk yield during lactation for sires producing daughters with superior 305MY indicate genetic differences between sires regarding their ability to transmit desirable persistency of lactation traits. This suggests that selection for total lactation milk yield does not identify sires or cows that are genetically superior in regard to persistency of lactation. Genetic evaluation for persistency of lactation is important for improving the efficiency of the milk production capacity of Holstein cows. |
publishDate |
2007 |
dc.date.none.fl_str_mv |
2007-10-10 2007 2022-09-29T20:05:52Z 2022-09-29T20:05:52Z |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/publishedVersion info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
Genetics and Molecular Biology, Ribeirão Preto, v. 30, n. 2, p. 349-355, 2007. http://www.alice.cnptia.embrapa.br/alice/handle/doc/595956 https://doi.org/10.1590/S1415-47572007000300009 |
identifier_str_mv |
Genetics and Molecular Biology, Ribeirão Preto, v. 30, n. 2, p. 349-355, 2007. |
url |
http://www.alice.cnptia.embrapa.br/alice/handle/doc/595956 https://doi.org/10.1590/S1415-47572007000300009 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa) instacron:EMBRAPA |
instname_str |
Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
instacron_str |
EMBRAPA |
institution |
EMBRAPA |
reponame_str |
Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) |
collection |
Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) |
repository.name.fl_str_mv |
Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
repository.mail.fl_str_mv |
cg-riaa@embrapa.br |
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1794503531942641664 |