Estimates of covariance functions for growth from birth to 630 days of age in Nelore cattle

Detalhes bibliográficos
Autor(a) principal: Albuquerque, L. G. [UNESP]
Data de Publicação: 2001
Outros Autores: Meyer, K.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://www.journalofanimalscience.org/content/79/11/2776.long
http://hdl.handle.net/11449/66724
Resumo: Weight records of Brazilian Nelore cattle, from birth to 630 d of age, recorded every 3 mo, were analyzed using random regression models. Independent variables were Legendre polynomials of age at recording. The model of analysis included contemporary groups as fixed effects and age of dam as a linear and quadratic covariable. Mean trends were modeled through a cubic regression on orthogonal polynomials of age. Up to four sets of random regression coefficients were fitted for animals' direct and maternal, additive genetic, and permanent environmental effects. Changes in measurement error variances with age were modeled through a variance function. Orders of polyno-mial fit from three to six were considered, resulting in up to 77 parameters to be estimated. Models fitting random regressions modeled the pattern of variances in the data adequately, with estimates similar to those from corresponding univariate analysis. Direct heritability estimates decreased after birth and tended to be lowest at ages at which maternal effect estimates tended to be highest. Maternal heritability estimates increased after birth to a peak around 110 to 120 d of age and decreased thereafter. Additive genetic direct correlation estimates between weights at standard ages (birth, weaning, yearling, and final weight) were moderate to high and maternal genetic and environmental correlations were consistently high. © 2001 American Society of Animal Science. All rights reserved.
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spelling Estimates of covariance functions for growth from birth to 630 days of age in Nelore cattleBeef cattleGrowthHeritabilityMaternal effectsZebu breedsWeight records of Brazilian Nelore cattle, from birth to 630 d of age, recorded every 3 mo, were analyzed using random regression models. Independent variables were Legendre polynomials of age at recording. The model of analysis included contemporary groups as fixed effects and age of dam as a linear and quadratic covariable. Mean trends were modeled through a cubic regression on orthogonal polynomials of age. Up to four sets of random regression coefficients were fitted for animals' direct and maternal, additive genetic, and permanent environmental effects. Changes in measurement error variances with age were modeled through a variance function. Orders of polyno-mial fit from three to six were considered, resulting in up to 77 parameters to be estimated. Models fitting random regressions modeled the pattern of variances in the data adequately, with estimates similar to those from corresponding univariate analysis. Direct heritability estimates decreased after birth and tended to be lowest at ages at which maternal effect estimates tended to be highest. Maternal heritability estimates increased after birth to a peak around 110 to 120 d of age and decreased thereafter. Additive genetic direct correlation estimates between weights at standard ages (birth, weaning, yearling, and final weight) were moderate to high and maternal genetic and environmental correlations were consistently high. © 2001 American Society of Animal Science. All rights reserved.Animal Genetics and Breeding Unit University of New England, Armidale, NSW 2351Departamento de Zootecnia Fac. de Cie. Agrarias e Veterinarias UNESP, Jaboticabal, SP 14884-900Departamento de Zootecnia FCAV UNESP, 14884-900 Jaboticabal, SPDepartamento de Zootecnia Fac. de Cie. Agrarias e Veterinarias UNESP, Jaboticabal, SP 14884-900Departamento de Zootecnia FCAV UNESP, 14884-900 Jaboticabal, SPUniversity of New EnglandUniversidade Estadual Paulista (Unesp)Albuquerque, L. G. [UNESP]Meyer, K.2014-05-27T11:20:22Z2014-05-27T11:20:22Z2001-12-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article2776-2789application/pdfhttp://www.journalofanimalscience.org/content/79/11/2776.longJournal of Animal Science, v. 79, n. 11, p. 2776-2789, 2001.0021-8812http://hdl.handle.net/11449/66724WOS:0001726430000042-s2.0-00355158692-s2.0-0035515869.pdfScopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Animal Science1.7110,848info:eu-repo/semantics/openAccess2024-06-07T18:43:05Zoai:repositorio.unesp.br:11449/66724Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T20:02:11.147455Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Estimates of covariance functions for growth from birth to 630 days of age in Nelore cattle
title Estimates of covariance functions for growth from birth to 630 days of age in Nelore cattle
spellingShingle Estimates of covariance functions for growth from birth to 630 days of age in Nelore cattle
Albuquerque, L. G. [UNESP]
Beef cattle
Growth
Heritability
Maternal effects
Zebu breeds
title_short Estimates of covariance functions for growth from birth to 630 days of age in Nelore cattle
title_full Estimates of covariance functions for growth from birth to 630 days of age in Nelore cattle
title_fullStr Estimates of covariance functions for growth from birth to 630 days of age in Nelore cattle
title_full_unstemmed Estimates of covariance functions for growth from birth to 630 days of age in Nelore cattle
title_sort Estimates of covariance functions for growth from birth to 630 days of age in Nelore cattle
author Albuquerque, L. G. [UNESP]
author_facet Albuquerque, L. G. [UNESP]
Meyer, K.
author_role author
author2 Meyer, K.
author2_role author
dc.contributor.none.fl_str_mv University of New England
Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Albuquerque, L. G. [UNESP]
Meyer, K.
dc.subject.por.fl_str_mv Beef cattle
Growth
Heritability
Maternal effects
Zebu breeds
topic Beef cattle
Growth
Heritability
Maternal effects
Zebu breeds
description Weight records of Brazilian Nelore cattle, from birth to 630 d of age, recorded every 3 mo, were analyzed using random regression models. Independent variables were Legendre polynomials of age at recording. The model of analysis included contemporary groups as fixed effects and age of dam as a linear and quadratic covariable. Mean trends were modeled through a cubic regression on orthogonal polynomials of age. Up to four sets of random regression coefficients were fitted for animals' direct and maternal, additive genetic, and permanent environmental effects. Changes in measurement error variances with age were modeled through a variance function. Orders of polyno-mial fit from three to six were considered, resulting in up to 77 parameters to be estimated. Models fitting random regressions modeled the pattern of variances in the data adequately, with estimates similar to those from corresponding univariate analysis. Direct heritability estimates decreased after birth and tended to be lowest at ages at which maternal effect estimates tended to be highest. Maternal heritability estimates increased after birth to a peak around 110 to 120 d of age and decreased thereafter. Additive genetic direct correlation estimates between weights at standard ages (birth, weaning, yearling, and final weight) were moderate to high and maternal genetic and environmental correlations were consistently high. © 2001 American Society of Animal Science. All rights reserved.
publishDate 2001
dc.date.none.fl_str_mv 2001-12-01
2014-05-27T11:20:22Z
2014-05-27T11:20:22Z
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://www.journalofanimalscience.org/content/79/11/2776.long
Journal of Animal Science, v. 79, n. 11, p. 2776-2789, 2001.
0021-8812
http://hdl.handle.net/11449/66724
WOS:000172643000004
2-s2.0-0035515869
2-s2.0-0035515869.pdf
url http://www.journalofanimalscience.org/content/79/11/2776.long
http://hdl.handle.net/11449/66724
identifier_str_mv Journal of Animal Science, v. 79, n. 11, p. 2776-2789, 2001.
0021-8812
WOS:000172643000004
2-s2.0-0035515869
2-s2.0-0035515869.pdf
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Journal of Animal Science
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dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 2776-2789
application/pdf
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)
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