Using nonlinear models to describe height growth curves in Pantaneiro horses

Detalhes bibliográficos
Autor(a) principal: Santos, Sandra Aparecida
Data de Publicação: 1999
Outros Autores: Souza, Geraldo da Silva e, Oliveira, Marcos Ruben de, Sereno, José Robson
Tipo de documento: Artigo
Idioma: por
Título da fonte: Pesquisa Agropecuária Brasileira (Online)
Texto Completo: https://seer.sct.embrapa.br/index.php/pab/article/view/5316
Resumo: Height at withers data mostly from birth to 36 months of age of 26 Pantaneiro horses were used to fit Brody, Richards, Gompertz, Logistic, Weibull and Morgan-Mercer-Flodin nonlinear response functions. Based on measures of average curvature and combined mean square error, the Weibull model was chosen. The asymptote of this curve, representing the average height at maturity, was higher for males than females. The maturity index, however, was more elevated for females than males. There was indication of a negative association between the maturity index and height at maturity only for females. These results indicate that females mature earlier. After checking for normality and homogeneity of variances within groups (sex) the analysis investigated sex differences via t-tests. A significant difference was detected only for height at birth.
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spelling Using nonlinear models to describe height growth curves in Pantaneiro horsesUso de modelos não-lineares para o ajuste de curvas de crescimento de cavalos Pantaneiroscurvature; growth; height-age relationshipscurvatura; crescimento; relações altura-idadeHeight at withers data mostly from birth to 36 months of age of 26 Pantaneiro horses were used to fit Brody, Richards, Gompertz, Logistic, Weibull and Morgan-Mercer-Flodin nonlinear response functions. Based on measures of average curvature and combined mean square error, the Weibull model was chosen. The asymptote of this curve, representing the average height at maturity, was higher for males than females. The maturity index, however, was more elevated for females than males. There was indication of a negative association between the maturity index and height at maturity only for females. These results indicate that females mature earlier. After checking for normality and homogeneity of variances within groups (sex) the analysis investigated sex differences via t-tests. A significant difference was detected only for height at birth.Dados de altura da cernelha e idade de 26 cavalos Pantaneiros, obtidos, na maioria, do nascimento até 36 meses, foram ajustados aos modelos de respostas não-lineares de Brody, Richards, Gompertz, Logístico, Weibull e Morgan-Mercer-Flodin. Estes seis modelos matemáticos foram comparados com o uso de uma medida de curvatura média e do erro médio quadrático combinado. O modelo de Weibull foi escolhido. A assíntota desta curva representa a altura esperada na maturidade. Os machos apresentaram um valor maior desta quantidade do que as fêmeas. O índice de maturidade, contudo, é maior para as fêmeas. Observou-se uma indicação de associação negativa entre altura na maturidade e índice de maturidade somente nas fêmeas. Tais resultados indicam que as fêmeas amadurecem mais cedo. Após testes de normalidade e homogeneidade de variância, as diferenças entre sexos foram analisadas com o uso do teste-t. Somente a altura da cernelha ao nascimento apresentou diferença significativa.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraSantos, Sandra AparecidaSouza, Geraldo da Silva eOliveira, Marcos Ruben deSereno, José Robson1999-07-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/5316Pesquisa Agropecuaria Brasileira; v.34, n.7, jul. 1999; 1133-1138Pesquisa Agropecuária Brasileira; v.34, n.7, jul. 1999; 1133-11381678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAporhttps://seer.sct.embrapa.br/index.php/pab/article/view/5316/2508info:eu-repo/semantics/openAccess2012-02-16T11:45:43Zoai:ojs.seer.sct.embrapa.br:article/5316Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2012-02-16T11:45:43Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false
dc.title.none.fl_str_mv Using nonlinear models to describe height growth curves in Pantaneiro horses
Uso de modelos não-lineares para o ajuste de curvas de crescimento de cavalos Pantaneiros
title Using nonlinear models to describe height growth curves in Pantaneiro horses
spellingShingle Using nonlinear models to describe height growth curves in Pantaneiro horses
Santos, Sandra Aparecida
curvature; growth; height-age relationships
curvatura; crescimento; relações altura-idade
title_short Using nonlinear models to describe height growth curves in Pantaneiro horses
title_full Using nonlinear models to describe height growth curves in Pantaneiro horses
title_fullStr Using nonlinear models to describe height growth curves in Pantaneiro horses
title_full_unstemmed Using nonlinear models to describe height growth curves in Pantaneiro horses
title_sort Using nonlinear models to describe height growth curves in Pantaneiro horses
author Santos, Sandra Aparecida
author_facet Santos, Sandra Aparecida
Souza, Geraldo da Silva e
Oliveira, Marcos Ruben de
Sereno, José Robson
author_role author
author2 Souza, Geraldo da Silva e
Oliveira, Marcos Ruben de
Sereno, José Robson
author2_role author
author
author
dc.contributor.none.fl_str_mv

dc.contributor.author.fl_str_mv Santos, Sandra Aparecida
Souza, Geraldo da Silva e
Oliveira, Marcos Ruben de
Sereno, José Robson
dc.subject.por.fl_str_mv curvature; growth; height-age relationships
curvatura; crescimento; relações altura-idade
topic curvature; growth; height-age relationships
curvatura; crescimento; relações altura-idade
description Height at withers data mostly from birth to 36 months of age of 26 Pantaneiro horses were used to fit Brody, Richards, Gompertz, Logistic, Weibull and Morgan-Mercer-Flodin nonlinear response functions. Based on measures of average curvature and combined mean square error, the Weibull model was chosen. The asymptote of this curve, representing the average height at maturity, was higher for males than females. The maturity index, however, was more elevated for females than males. There was indication of a negative association between the maturity index and height at maturity only for females. These results indicate that females mature earlier. After checking for normality and homogeneity of variances within groups (sex) the analysis investigated sex differences via t-tests. A significant difference was detected only for height at birth.
publishDate 1999
dc.date.none.fl_str_mv 1999-07-01
dc.type.none.fl_str_mv
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://seer.sct.embrapa.br/index.php/pab/article/view/5316
url https://seer.sct.embrapa.br/index.php/pab/article/view/5316
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv https://seer.sct.embrapa.br/index.php/pab/article/view/5316/2508
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Pesquisa Agropecuaria Brasileira
Pesquisa Agropecuária Brasileira
publisher.none.fl_str_mv Pesquisa Agropecuaria Brasileira
Pesquisa Agropecuária Brasileira
dc.source.none.fl_str_mv Pesquisa Agropecuaria Brasileira; v.34, n.7, jul. 1999; 1133-1138
Pesquisa Agropecuária Brasileira; v.34, n.7, jul. 1999; 1133-1138
1678-3921
0100-104x
reponame:Pesquisa Agropecuária Brasileira (Online)
instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron:EMBRAPA
instname_str Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron_str EMBRAPA
institution EMBRAPA
reponame_str Pesquisa Agropecuária Brasileira (Online)
collection Pesquisa Agropecuária Brasileira (Online)
repository.name.fl_str_mv Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
repository.mail.fl_str_mv pab@sct.embrapa.br || sct.pab@embrapa.br
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