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: LOCUS Repositório Institucional da UFV
Texto Completo: http://dx.doi.org/10.1590/0034-737x201865010004
http://www.locus.ufv.br/handle/123456789/23241
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. Weightage 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 (R 2 ).
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spelling Isotonic regression analysis of Guzerá cattle growth curvesData transformationIsotonizationNon- linear modelsTransformação de dadosIsotonizaçãoModelos não linearesThe 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. Weightage 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 (R 2 ).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 (R 2 ).Revista Ceres2019-01-30T10:59:49Z2019-01-30T10:59:49Z2018-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlepdfapplication/pdf2177-3491http://dx.doi.org/10.1590/0034-737x201865010004http://www.locus.ufv.br/handle/123456789/23241engv. 65, n. 1, p. 24- 27, jan./ feb. 2018Rodrigues, AdrianoChaves, Lucas MonteiroSilva, Fabyano FonsecaGarcia, Idalmo PereiraDuarte, Darlene Ana SouzaVentura, Henrique Torresinfo:eu-repo/semantics/openAccessreponame:LOCUS Repositório Institucional da UFVinstname:Universidade Federal de Viçosa (UFV)instacron:UFV2024-07-12T07:59:07Zoai:locus.ufv.br:123456789/23241Repositório InstitucionalPUBhttps://www.locus.ufv.br/oai/requestfabiojreis@ufv.bropendoar:21452024-07-12T07:59:07LOCUS Repositório Institucional da UFV - Universidade Federal de Viçosa (UFV)false
dc.title.none.fl_str_mv Isotonic regression analysis of Guzerá cattle growth curves
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
Transformação de dados
Isotonização
Modelos não lineares
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
Transformação de dados
Isotonização
Modelos não lineares
topic Data transformation
Isotonization
Non- linear models
Transformação de dados
Isotonização
Modelos não lineares
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. Weightage 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 (R 2 ).
publishDate 2018
dc.date.none.fl_str_mv 2018-01
2019-01-30T10:59:49Z
2019-01-30T10:59:49Z
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 2177-3491
http://dx.doi.org/10.1590/0034-737x201865010004
http://www.locus.ufv.br/handle/123456789/23241
identifier_str_mv 2177-3491
url http://dx.doi.org/10.1590/0034-737x201865010004
http://www.locus.ufv.br/handle/123456789/23241
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv v. 65, n. 1, p. 24- 27, jan./ feb. 2018
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv pdf
application/pdf
dc.publisher.none.fl_str_mv Revista Ceres
publisher.none.fl_str_mv Revista Ceres
dc.source.none.fl_str_mv reponame:LOCUS Repositório Institucional da UFV
instname:Universidade Federal de Viçosa (UFV)
instacron:UFV
instname_str Universidade Federal de Viçosa (UFV)
instacron_str UFV
institution UFV
reponame_str LOCUS Repositório Institucional da UFV
collection LOCUS Repositório Institucional da UFV
repository.name.fl_str_mv LOCUS Repositório Institucional da UFV - Universidade Federal de Viçosa (UFV)
repository.mail.fl_str_mv fabiojreis@ufv.br
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