Isotonic regression analysis of Guzerá cattle growth curves

Detalhes bibliográficos
Autor(a) principal: Rodrigues, Adriano
Data de Publicação: 2018
Outros Autores: Chaves, Lucas Monteiro, Silva, Fabyano Fonseca, Garcia, Idalmo Pereira, Duarte, Darlene Ana Souza, Ventura, Henrique Torres
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFLA
Texto Completo: http://repositorio.ufla.br/jspui/handle/1/34512
Resumo: The objective of this study was to apply data transformation via isotonic regression in growth curves studies of Guzerá cattle whose data presented disturbances characterized by decreased body weight in certain age groups. Weight-age data were collected on newly weaned Guzerá males according to the methodology of weight gain tests (WGT) defined by the Brazilian Association of Zebu Breeders (ABCZ). The Logistic, Von Bertalanffy and Gompertz models were fitted to weight-age data using the generalized least squares method for non-linear regression models through the Gauss-Newton algorithm. The proposed transformation based on isotonic regression theory proved to be efficient; and the Logistic model was the best to describe the growth of animals, with a high percentage of convergence (100%) and goodness of fit assessed by the mean squared error (MSE) and the coefficient of determination (R2).
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spelling Isotonic regression analysis of Guzerá cattle growth curvesRegressão isotônica para estudos de curvas de crescimento de bovinos GuzeráData transformationIsotonizationNon-linear modelsGuzera - Growth curvesTransformação de dadosIsotonizaçãoModelos não linearesGuzerá - Curvas de crescimentoThe objective of this study was to apply data transformation via isotonic regression in growth curves studies of Guzerá cattle whose data presented disturbances characterized by decreased body weight in certain age groups. Weight-age data were collected on newly weaned Guzerá males according to the methodology of weight gain tests (WGT) defined by the Brazilian Association of Zebu Breeders (ABCZ). The Logistic, Von Bertalanffy and Gompertz models were fitted to weight-age data using the generalized least squares method for non-linear regression models through the Gauss-Newton algorithm. The proposed transformation based on isotonic regression theory proved to be efficient; and the Logistic model was the best to describe the growth of animals, with a high percentage of convergence (100%) and goodness of fit assessed by the mean squared error (MSE) and the coefficient of determination (R2).Objetivou-se aplicar a transformação de dados via regressão isotônica em estudos de crescimento de animais da raça Guzerá cujos dados apresentam distúrbios caracterizados por decréscimos de pesos em determinadas faixas de idades. Foram tomadas observações de peso-idade de machos da raça Guzerá recém-desmamados obedecendo à metodologia das provas de ganho de peso (PGP) definidas pela Associação Brasileira dos Criadores de Zebu (ABCZ). Os modelos Logístico, Von Bertalanffy e Gompertz foram ajustados aos dados de peso-idade por meio do método dos quadrados mínimos ordinários generalizados para modelos de regressão não linear via algoritmo de Gauss-Newton. A transformação proposta por meio da teoria de regressão isotônica mostrou-se eficiente, e o modelo Logístico foi o mais adequado para descrever o crescimento dos animais por apresentar alta porcentagem de convergência (100%) e qualidade de ajuste satisfatória, medida por meio do quadrado médio do erro (QME) e do coeficiente de determinação (R2).Universidade Federal de Viçosa2019-06-03T12:23:19Z2019-06-03T12:23:19Z2018-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfRODRIGUES, A. et al. Isotonic regression analysis of Guzerá cattle growth curves. Ceres, Viçosa, MG, v. 65, n. 1, p. 24-27, jan./fev. 2018.http://repositorio.ufla.br/jspui/handle/1/34512Ceresreponame:Repositório Institucional da UFLAinstname:Universidade Federal de Lavras (UFLA)instacron:UFLAhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessRodrigues, AdrianoChaves, Lucas MonteiroSilva, Fabyano FonsecaGarcia, Idalmo PereiraDuarte, Darlene Ana SouzaVentura, Henrique Torreseng2023-05-26T19:36:04Zoai:localhost:1/34512Repositório InstitucionalPUBhttp://repositorio.ufla.br/oai/requestnivaldo@ufla.br || repositorio.biblioteca@ufla.bropendoar:2023-05-26T19:36:04Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)false
dc.title.none.fl_str_mv Isotonic regression analysis of Guzerá cattle growth curves
Regressão isotônica para estudos de curvas de crescimento de bovinos Guzerá
title Isotonic regression analysis of Guzerá cattle growth curves
spellingShingle Isotonic regression analysis of Guzerá cattle growth curves
Rodrigues, Adriano
Data transformation
Isotonization
Non-linear models
Guzera - Growth curves
Transformação de dados
Isotonização
Modelos não lineares
Guzerá - Curvas de crescimento
title_short Isotonic regression analysis of Guzerá cattle growth curves
title_full Isotonic regression analysis of Guzerá cattle growth curves
title_fullStr Isotonic regression analysis of Guzerá cattle growth curves
title_full_unstemmed Isotonic regression analysis of Guzerá cattle growth curves
title_sort Isotonic regression analysis of Guzerá cattle growth curves
author Rodrigues, Adriano
author_facet Rodrigues, Adriano
Chaves, Lucas Monteiro
Silva, Fabyano Fonseca
Garcia, Idalmo Pereira
Duarte, Darlene Ana Souza
Ventura, Henrique Torres
author_role author
author2 Chaves, Lucas Monteiro
Silva, Fabyano Fonseca
Garcia, Idalmo Pereira
Duarte, Darlene Ana Souza
Ventura, Henrique Torres
author2_role author
author
author
author
author
dc.contributor.author.fl_str_mv Rodrigues, Adriano
Chaves, Lucas Monteiro
Silva, Fabyano Fonseca
Garcia, Idalmo Pereira
Duarte, Darlene Ana Souza
Ventura, Henrique Torres
dc.subject.por.fl_str_mv Data transformation
Isotonization
Non-linear models
Guzera - Growth curves
Transformação de dados
Isotonização
Modelos não lineares
Guzerá - Curvas de crescimento
topic Data transformation
Isotonization
Non-linear models
Guzera - Growth curves
Transformação de dados
Isotonização
Modelos não lineares
Guzerá - Curvas de crescimento
description The objective of this study was to apply data transformation via isotonic regression in growth curves studies of Guzerá cattle whose data presented disturbances characterized by decreased body weight in certain age groups. Weight-age data were collected on newly weaned Guzerá males according to the methodology of weight gain tests (WGT) defined by the Brazilian Association of Zebu Breeders (ABCZ). The Logistic, Von Bertalanffy and Gompertz models were fitted to weight-age data using the generalized least squares method for non-linear regression models through the Gauss-Newton algorithm. The proposed transformation based on isotonic regression theory proved to be efficient; and the Logistic model was the best to describe the growth of animals, with a high percentage of convergence (100%) and goodness of fit assessed by the mean squared error (MSE) and the coefficient of determination (R2).
publishDate 2018
dc.date.none.fl_str_mv 2018-01
2019-06-03T12:23:19Z
2019-06-03T12:23:19Z
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 RODRIGUES, A. et al. Isotonic regression analysis of Guzerá cattle growth curves. Ceres, Viçosa, MG, v. 65, n. 1, p. 24-27, jan./fev. 2018.
http://repositorio.ufla.br/jspui/handle/1/34512
identifier_str_mv RODRIGUES, A. et al. Isotonic regression analysis of Guzerá cattle growth curves. Ceres, Viçosa, MG, v. 65, n. 1, p. 24-27, jan./fev. 2018.
url http://repositorio.ufla.br/jspui/handle/1/34512
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv http://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidade Federal de Viçosa
publisher.none.fl_str_mv Universidade Federal de Viçosa
dc.source.none.fl_str_mv Ceres
reponame:Repositório Institucional da UFLA
instname:Universidade Federal de Lavras (UFLA)
instacron:UFLA
instname_str Universidade Federal de Lavras (UFLA)
instacron_str UFLA
institution UFLA
reponame_str Repositório Institucional da UFLA
collection Repositório Institucional da UFLA
repository.name.fl_str_mv Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)
repository.mail.fl_str_mv nivaldo@ufla.br || repositorio.biblioteca@ufla.br
_version_ 1815439123582812160

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