Estimates of covariance functions for growth from birth to 630 days of age in Nelore cattle
Autor(a) principal: | |
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Data de Publicação: | 2001 |
Outros Autores: | |
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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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 1.711 0,848 |
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) |
repository.mail.fl_str_mv |
|
_version_ |
1808129152787677184 |