Random regression models on Legendre polynomials to estimate genetic parameters for weights from birth to adult age in Canchim cattle

Detalhes bibliográficos
Autor(a) principal: Baldi, Fernando
Data de Publicação: 2010
Outros Autores: Albuquerque, L. G., Alencar, M. M.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1111/j.1439-0388.2010.00853.x
http://hdl.handle.net/11449/231243
Resumo: The objective of this work was to estimate covariance functions for direct and maternal genetic effects, animal and maternal permanent environmental effects, and subsequently, to derive relevant genetic parameters for growth traits in Canchim cattle. Data comprised 49 011 weight records on 2435 females from birth to adult age. The model of analysis included fixed effects of contemporary groups (year and month of birth and at weighing) and age of dam as quadratic covariable. Mean trends were taken into account by a cubic regression on orthogonal polynomials of animal age. Residual variances were allowed to vary and were modelled by a step function with 1, 4 or 11 classes based on animal's age. The model fitting four classes of residual variances was the best. A total of 12 random regression models from second to seventh order were used to model direct and maternal genetic effects, animal and maternal permanent environmental effects. The model with direct and maternal genetic effects, animal and maternal permanent environmental effects fitted by quadric, cubic, quintic and linear Legendre polynomials, respectively, was the most adequate to describe the covariance structure of the data. Estimates of direct and maternal heritability obtained by multi-trait (seven traits) and random regression models were very similar. Selection for higher weight at any age, especially after weaning, will produce an increase in mature cow weight. The possibility to modify the growth curve in Canchim cattle to obtain animals with rapid growth at early ages and moderate to low mature cow weight is limited. © 2010 Blackwell Verlag GmbH.
id UNSP_002699a8c0264cb1c07e980fe7337a49
oai_identifier_str oai:repositorio.unesp.br:11449/231243
network_acronym_str UNSP
network_name_str Repositório Institucional da UNESP
repository_id_str 2946
spelling Random regression models on Legendre polynomials to estimate genetic parameters for weights from birth to adult age in Canchim cattleBeef cattleCovariance functionsGrowth curveLegendre polynomialsThe objective of this work was to estimate covariance functions for direct and maternal genetic effects, animal and maternal permanent environmental effects, and subsequently, to derive relevant genetic parameters for growth traits in Canchim cattle. Data comprised 49 011 weight records on 2435 females from birth to adult age. The model of analysis included fixed effects of contemporary groups (year and month of birth and at weighing) and age of dam as quadratic covariable. Mean trends were taken into account by a cubic regression on orthogonal polynomials of animal age. Residual variances were allowed to vary and were modelled by a step function with 1, 4 or 11 classes based on animal's age. The model fitting four classes of residual variances was the best. A total of 12 random regression models from second to seventh order were used to model direct and maternal genetic effects, animal and maternal permanent environmental effects. The model with direct and maternal genetic effects, animal and maternal permanent environmental effects fitted by quadric, cubic, quintic and linear Legendre polynomials, respectively, was the most adequate to describe the covariance structure of the data. Estimates of direct and maternal heritability obtained by multi-trait (seven traits) and random regression models were very similar. Selection for higher weight at any age, especially after weaning, will produce an increase in mature cow weight. The possibility to modify the growth curve in Canchim cattle to obtain animals with rapid growth at early ages and moderate to low mature cow weight is limited. © 2010 Blackwell Verlag GmbH.Animal Science Departament FCAV, University of São Paulo State, Jaboticabal (SP) 14884 000Southeast Embrapa Cattle, 13560 970, São Carlos (SP)Universidade de São Paulo (USP)Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA)Baldi, FernandoAlbuquerque, L. G.Alencar, M. M.2022-04-29T08:44:18Z2022-04-29T08:44:18Z2010-08-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article289-299http://dx.doi.org/10.1111/j.1439-0388.2010.00853.xJournal of Animal Breeding and Genetics, v. 127, n. 4, p. 289-299, 2010.0931-26681439-0388http://hdl.handle.net/11449/23124310.1111/j.1439-0388.2010.00853.x2-s2.0-77955193516Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Animal Breeding and Geneticsinfo:eu-repo/semantics/openAccess2022-04-29T08:44:18Zoai:repositorio.unesp.br:11449/231243Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462022-04-29T08:44:18Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Random regression models on Legendre polynomials to estimate genetic parameters for weights from birth to adult age in Canchim cattle
title Random regression models on Legendre polynomials to estimate genetic parameters for weights from birth to adult age in Canchim cattle
spellingShingle Random regression models on Legendre polynomials to estimate genetic parameters for weights from birth to adult age in Canchim cattle
Baldi, Fernando
Beef cattle
Covariance functions
Growth curve
Legendre polynomials
title_short Random regression models on Legendre polynomials to estimate genetic parameters for weights from birth to adult age in Canchim cattle
title_full Random regression models on Legendre polynomials to estimate genetic parameters for weights from birth to adult age in Canchim cattle
title_fullStr Random regression models on Legendre polynomials to estimate genetic parameters for weights from birth to adult age in Canchim cattle
title_full_unstemmed Random regression models on Legendre polynomials to estimate genetic parameters for weights from birth to adult age in Canchim cattle
title_sort Random regression models on Legendre polynomials to estimate genetic parameters for weights from birth to adult age in Canchim cattle
author Baldi, Fernando
author_facet Baldi, Fernando
Albuquerque, L. G.
Alencar, M. M.
author_role author
author2 Albuquerque, L. G.
Alencar, M. M.
author2_role author
author
dc.contributor.none.fl_str_mv Universidade de São Paulo (USP)
Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA)
dc.contributor.author.fl_str_mv Baldi, Fernando
Albuquerque, L. G.
Alencar, M. M.
dc.subject.por.fl_str_mv Beef cattle
Covariance functions
Growth curve
Legendre polynomials
topic Beef cattle
Covariance functions
Growth curve
Legendre polynomials
description The objective of this work was to estimate covariance functions for direct and maternal genetic effects, animal and maternal permanent environmental effects, and subsequently, to derive relevant genetic parameters for growth traits in Canchim cattle. Data comprised 49 011 weight records on 2435 females from birth to adult age. The model of analysis included fixed effects of contemporary groups (year and month of birth and at weighing) and age of dam as quadratic covariable. Mean trends were taken into account by a cubic regression on orthogonal polynomials of animal age. Residual variances were allowed to vary and were modelled by a step function with 1, 4 or 11 classes based on animal's age. The model fitting four classes of residual variances was the best. A total of 12 random regression models from second to seventh order were used to model direct and maternal genetic effects, animal and maternal permanent environmental effects. The model with direct and maternal genetic effects, animal and maternal permanent environmental effects fitted by quadric, cubic, quintic and linear Legendre polynomials, respectively, was the most adequate to describe the covariance structure of the data. Estimates of direct and maternal heritability obtained by multi-trait (seven traits) and random regression models were very similar. Selection for higher weight at any age, especially after weaning, will produce an increase in mature cow weight. The possibility to modify the growth curve in Canchim cattle to obtain animals with rapid growth at early ages and moderate to low mature cow weight is limited. © 2010 Blackwell Verlag GmbH.
publishDate 2010
dc.date.none.fl_str_mv 2010-08-01
2022-04-29T08:44:18Z
2022-04-29T08:44:18Z
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/10.1111/j.1439-0388.2010.00853.x
Journal of Animal Breeding and Genetics, v. 127, n. 4, p. 289-299, 2010.
0931-2668
1439-0388
http://hdl.handle.net/11449/231243
10.1111/j.1439-0388.2010.00853.x
2-s2.0-77955193516
url http://dx.doi.org/10.1111/j.1439-0388.2010.00853.x
http://hdl.handle.net/11449/231243
identifier_str_mv Journal of Animal Breeding and Genetics, v. 127, n. 4, p. 289-299, 2010.
0931-2668
1439-0388
10.1111/j.1439-0388.2010.00853.x
2-s2.0-77955193516
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Journal of Animal Breeding and Genetics
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 289-299
dc.source.none.fl_str_mv Scopus
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_ 1799964421860098048