Effect of pregnancy on the genetic evaluation of dairy cattle
Autor(a) principal: | |
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Data de Publicação: | 2011 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.4238/vol10-3gmr1151 http://hdl.handle.net/11449/4960 |
Resumo: | We investigated the effect of stage of pregnancy on estimates of breeding values for milk yield and milk persistency in Gyr and Holstein dairy cattle in Brazil. Test-day milk yield records were analyzed using random regression models with or without the effect of pregnancy. Models were compared using residual variances, heritabilities, rank correlations of estimated breeding values of bulls and cows, and number of nonpregnant cows in the top 200 for milk yield and milk persistency. The estimates of residual variance and heritabilities obtained with the models with or without the effect of pregnancy were similar for the two breeds. Inclusion of the effect of pregnancy in genetic evaluation models for these populations did not affect the ranking of cows and sires based on their predicted breeding values for 305-day cumulative milk yield. In contrast, when we examined persistency of milk yield, lack of adjustment for the effect of pregnancy overestimated breeding values of nonpregnant cows and cows with a long days open period and underestimated breeding values of cows with a short days open period. We recommend that models include the effect of days of pregnancy for estimation of adjustment factors for the effect of pregnancy in genetic evaluations of Dairy Gyr and Holstein cattle. |
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Effect of pregnancy on the genetic evaluation of dairy cattleDays openLactation curvesRandom regression modelsStage of pregnancyWe investigated the effect of stage of pregnancy on estimates of breeding values for milk yield and milk persistency in Gyr and Holstein dairy cattle in Brazil. Test-day milk yield records were analyzed using random regression models with or without the effect of pregnancy. Models were compared using residual variances, heritabilities, rank correlations of estimated breeding values of bulls and cows, and number of nonpregnant cows in the top 200 for milk yield and milk persistency. The estimates of residual variance and heritabilities obtained with the models with or without the effect of pregnancy were similar for the two breeds. Inclusion of the effect of pregnancy in genetic evaluation models for these populations did not affect the ranking of cows and sires based on their predicted breeding values for 305-day cumulative milk yield. In contrast, when we examined persistency of milk yield, lack of adjustment for the effect of pregnancy overestimated breeding values of nonpregnant cows and cows with a long days open period and underestimated breeding values of cows with a short days open period. We recommend that models include the effect of days of pregnancy for estimation of adjustment factors for the effect of pregnancy in genetic evaluations of Dairy Gyr and Holstein cattle.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG)Univ Estadual Paulista, Dept Zootecnia, Fac Ciencias Agr Vet, Jaboticabal, SP, BrazilUniv Fed Mato Grosso, Inst Ciencias Agr Tecnol, Rondonopolis, MT, BrazilEmpresa Brasileira de Pesquisa Agropecuária (EMBRAPA) Gado Leite, Juiz de Fora, MG, BrazilAgencia Paulista Tecnol Agronegocios, Secretaria Agr Abastecimento, Ribeirao Preto, SP, BrazilUniv Estadual Paulista, Dept Zootecnia, Fac Ciencias Agr Vet, Jaboticabal, SP, BrazilFunpec-editoraUniversidade Estadual Paulista (Unesp)Univ Fed Mato GrossoEmpresa Brasileira de Pesquisa Agropecuária (EMBRAPA)Agência Paulista de Tecnologia dos Agronegócios (APTA)Pereira, R. J. [UNESP]Santana, M. L.Bignardi, A. B. [UNESP]Verneque, R. S.El Faro, L.Albuquerque, Lucia Galvão de [UNESP]2014-05-20T13:19:11Z2014-05-20T13:19:11Z2011-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article2190-2201application/pdfhttp://dx.doi.org/10.4238/vol10-3gmr1151Genetics and Molecular Research. Ribeirao Preto: Funpec-editora, v. 10, n. 3, p. 2190-2201, 2011.1676-5680http://hdl.handle.net/11449/496010.4238/vol10-3gmr1151WOS:000295823500089WOS000295823500089.pdf5866981114947883Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengGenetics and Molecular Research0,439info:eu-repo/semantics/openAccess2023-11-23T06:12:40Zoai:repositorio.unesp.br:11449/4960Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462023-11-23T06:12:40Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Effect of pregnancy on the genetic evaluation of dairy cattle |
title |
Effect of pregnancy on the genetic evaluation of dairy cattle |
spellingShingle |
Effect of pregnancy on the genetic evaluation of dairy cattle Pereira, R. J. [UNESP] Days open Lactation curves Random regression models Stage of pregnancy |
title_short |
Effect of pregnancy on the genetic evaluation of dairy cattle |
title_full |
Effect of pregnancy on the genetic evaluation of dairy cattle |
title_fullStr |
Effect of pregnancy on the genetic evaluation of dairy cattle |
title_full_unstemmed |
Effect of pregnancy on the genetic evaluation of dairy cattle |
title_sort |
Effect of pregnancy on the genetic evaluation of dairy cattle |
author |
Pereira, R. J. [UNESP] |
author_facet |
Pereira, R. J. [UNESP] Santana, M. L. Bignardi, A. B. [UNESP] Verneque, R. S. El Faro, L. Albuquerque, Lucia Galvão de [UNESP] |
author_role |
author |
author2 |
Santana, M. L. Bignardi, A. B. [UNESP] Verneque, R. S. El Faro, L. Albuquerque, Lucia Galvão de [UNESP] |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) Univ Fed Mato Grosso Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA) Agência Paulista de Tecnologia dos Agronegócios (APTA) |
dc.contributor.author.fl_str_mv |
Pereira, R. J. [UNESP] Santana, M. L. Bignardi, A. B. [UNESP] Verneque, R. S. El Faro, L. Albuquerque, Lucia Galvão de [UNESP] |
dc.subject.por.fl_str_mv |
Days open Lactation curves Random regression models Stage of pregnancy |
topic |
Days open Lactation curves Random regression models Stage of pregnancy |
description |
We investigated the effect of stage of pregnancy on estimates of breeding values for milk yield and milk persistency in Gyr and Holstein dairy cattle in Brazil. Test-day milk yield records were analyzed using random regression models with or without the effect of pregnancy. Models were compared using residual variances, heritabilities, rank correlations of estimated breeding values of bulls and cows, and number of nonpregnant cows in the top 200 for milk yield and milk persistency. The estimates of residual variance and heritabilities obtained with the models with or without the effect of pregnancy were similar for the two breeds. Inclusion of the effect of pregnancy in genetic evaluation models for these populations did not affect the ranking of cows and sires based on their predicted breeding values for 305-day cumulative milk yield. In contrast, when we examined persistency of milk yield, lack of adjustment for the effect of pregnancy overestimated breeding values of nonpregnant cows and cows with a long days open period and underestimated breeding values of cows with a short days open period. We recommend that models include the effect of days of pregnancy for estimation of adjustment factors for the effect of pregnancy in genetic evaluations of Dairy Gyr and Holstein cattle. |
publishDate |
2011 |
dc.date.none.fl_str_mv |
2011-01-01 2014-05-20T13:19:11Z 2014-05-20T13:19:11Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.4238/vol10-3gmr1151 Genetics and Molecular Research. Ribeirao Preto: Funpec-editora, v. 10, n. 3, p. 2190-2201, 2011. 1676-5680 http://hdl.handle.net/11449/4960 10.4238/vol10-3gmr1151 WOS:000295823500089 WOS000295823500089.pdf 5866981114947883 |
url |
http://dx.doi.org/10.4238/vol10-3gmr1151 http://hdl.handle.net/11449/4960 |
identifier_str_mv |
Genetics and Molecular Research. Ribeirao Preto: Funpec-editora, v. 10, n. 3, p. 2190-2201, 2011. 1676-5680 10.4238/vol10-3gmr1151 WOS:000295823500089 WOS000295823500089.pdf 5866981114947883 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Genetics and Molecular Research 0,439 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
2190-2201 application/pdf |
dc.publisher.none.fl_str_mv |
Funpec-editora |
publisher.none.fl_str_mv |
Funpec-editora |
dc.source.none.fl_str_mv |
Web of Science reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1797789793278492672 |