Non-linear mixed models in the study of growth of naturalized chickens

Detalhes bibliográficos
Autor(a) principal: Ibiapina Neto,Vicente
Data de Publicação: 2020
Outros Autores: Barbosa,Firmino José Vieira, Campelo,José Elivalto Guimarães, Sarmento,José Lindenberg Rocha
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Revista Brasileira de Zootecnia (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982020000100603
Resumo: ABSTRACT This study was conducted to examine the inclusion of random effects in non-linear models, identify the most suitable models, and describe the growth of naturalized chickens. Live-weight records of 166 birds of the Graúna Dourada, Nordestina, and Teresina ecotypes were estimated. The asymptotic weight (A), integration constant, related to animal initial weight (B), and the maturing rate (k) parameters of the non-linear Gompertz, Logistic, and von Bertalanffy models were estimated and adjusted using the Gauss-Newton method. Residual variance decreased by more than 50% when random effects were added to the model. The best fits in the estimate of the growth curve of females were obtained by associating the random effects with the three parameters of the Gompertz and Logistic models. The association of random effects with two parameters (asymptotic weight and maturing rate) and with the three parameters of the Logistic model provided the best fits for the males. The Teresina ecotype has the highest adult weight in both sexes, despite its slower growth. The opposite is true for the Graúna Dourada ecotype, formed by lighter and earlier-growing animals. The inclusion of random effects in models provides greater accuracy in the estimate of the growth curve.
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spelling Non-linear mixed models in the study of growth of naturalized chickensGompertzmodellingphenotypic variationroosterABSTRACT This study was conducted to examine the inclusion of random effects in non-linear models, identify the most suitable models, and describe the growth of naturalized chickens. Live-weight records of 166 birds of the Graúna Dourada, Nordestina, and Teresina ecotypes were estimated. The asymptotic weight (A), integration constant, related to animal initial weight (B), and the maturing rate (k) parameters of the non-linear Gompertz, Logistic, and von Bertalanffy models were estimated and adjusted using the Gauss-Newton method. Residual variance decreased by more than 50% when random effects were added to the model. The best fits in the estimate of the growth curve of females were obtained by associating the random effects with the three parameters of the Gompertz and Logistic models. The association of random effects with two parameters (asymptotic weight and maturing rate) and with the three parameters of the Logistic model provided the best fits for the males. The Teresina ecotype has the highest adult weight in both sexes, despite its slower growth. The opposite is true for the Graúna Dourada ecotype, formed by lighter and earlier-growing animals. The inclusion of random effects in models provides greater accuracy in the estimate of the growth curve.Sociedade Brasileira de Zootecnia2020-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982020000100603Revista Brasileira de Zootecnia v.49 2020reponame:Revista Brasileira de Zootecnia (Online)instname:Sociedade Brasileira de Zootecnia (SBZ)instacron:SBZ10.37496/rbz4920190201info:eu-repo/semantics/openAccessIbiapina Neto,VicenteBarbosa,Firmino José VieiraCampelo,José Elivalto GuimarãesSarmento,José Lindenberg Rochaeng2020-05-12T00:00:00Zoai:scielo:S1516-35982020000100603Revistahttps://www.rbz.org.br/pt-br/https://old.scielo.br/oai/scielo-oai.php||bz@sbz.org.br|| secretariarbz@sbz.org.br1806-92901516-3598opendoar:2020-05-12T00:00Revista Brasileira de Zootecnia (Online) - Sociedade Brasileira de Zootecnia (SBZ)false
dc.title.none.fl_str_mv Non-linear mixed models in the study of growth of naturalized chickens
title Non-linear mixed models in the study of growth of naturalized chickens
spellingShingle Non-linear mixed models in the study of growth of naturalized chickens
Ibiapina Neto,Vicente
Gompertz
modelling
phenotypic variation
rooster
title_short Non-linear mixed models in the study of growth of naturalized chickens
title_full Non-linear mixed models in the study of growth of naturalized chickens
title_fullStr Non-linear mixed models in the study of growth of naturalized chickens
title_full_unstemmed Non-linear mixed models in the study of growth of naturalized chickens
title_sort Non-linear mixed models in the study of growth of naturalized chickens
author Ibiapina Neto,Vicente
author_facet Ibiapina Neto,Vicente
Barbosa,Firmino José Vieira
Campelo,José Elivalto Guimarães
Sarmento,José Lindenberg Rocha
author_role author
author2 Barbosa,Firmino José Vieira
Campelo,José Elivalto Guimarães
Sarmento,José Lindenberg Rocha
author2_role author
author
author
dc.contributor.author.fl_str_mv Ibiapina Neto,Vicente
Barbosa,Firmino José Vieira
Campelo,José Elivalto Guimarães
Sarmento,José Lindenberg Rocha
dc.subject.por.fl_str_mv Gompertz
modelling
phenotypic variation
rooster
topic Gompertz
modelling
phenotypic variation
rooster
description ABSTRACT This study was conducted to examine the inclusion of random effects in non-linear models, identify the most suitable models, and describe the growth of naturalized chickens. Live-weight records of 166 birds of the Graúna Dourada, Nordestina, and Teresina ecotypes were estimated. The asymptotic weight (A), integration constant, related to animal initial weight (B), and the maturing rate (k) parameters of the non-linear Gompertz, Logistic, and von Bertalanffy models were estimated and adjusted using the Gauss-Newton method. Residual variance decreased by more than 50% when random effects were added to the model. The best fits in the estimate of the growth curve of females were obtained by associating the random effects with the three parameters of the Gompertz and Logistic models. The association of random effects with two parameters (asymptotic weight and maturing rate) and with the three parameters of the Logistic model provided the best fits for the males. The Teresina ecotype has the highest adult weight in both sexes, despite its slower growth. The opposite is true for the Graúna Dourada ecotype, formed by lighter and earlier-growing animals. The inclusion of random effects in models provides greater accuracy in the estimate of the growth curve.
publishDate 2020
dc.date.none.fl_str_mv 2020-01-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
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dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982020000100603
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982020000100603
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.37496/rbz4920190201
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dc.publisher.none.fl_str_mv Sociedade Brasileira de Zootecnia
publisher.none.fl_str_mv Sociedade Brasileira de Zootecnia
dc.source.none.fl_str_mv Revista Brasileira de Zootecnia v.49 2020
reponame:Revista Brasileira de Zootecnia (Online)
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