The fitting of nonlinear models to growing pigs data
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Publication Date: | 2014 |
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Format: | Article |
Language: | por |
Source: | Pesquisa Agropecuária Brasileira (Online) |
Download full: | https://seer.sct.embrapa.br/index.php/pab/article/view/15452 |
Summary: | Five nonlinear models were fitted to weight-age data from birth to 168 days collected in 127 Large White and 143 Landrace pigs, tested at Concórdia, SC, Brazil, during 1979 and 1980. The purpose of this experiment was to determine the best equation for fitting, computacional ease and biological interpretability of the parameters. The pigs were fed from 76 to 114 days with a ration containing 3,300 kcal/kg GE and 18% crude protein, and from 114 to 168 days a finishing ration with 3,250 kcal/kg GE and 16% crude protein. Both feed and water were available ad libitum. Weight data at birth at 21 days, and weekly from 60 to 168 days were used to fit the models. Based on the adjusted coefficient of determination (R2), residual mean squares and biological interpretability of parameter fitted, the Logistic model with variable inflection point in M, provided the best results for the present study. Two models provided poor estimates of observed weights both in the initial and final phase of the studied period. The highest rate of maturity was provided by the Logistic model. All models showed good adjustment. The best results were obtained with male swine independently of race. |
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The fitting of nonlinear models to growing pigs dataAjustamento de modelos não-lineares a dados de crescimento de suínosgrowth curves; Logistic model; Gompertz model; Bertalanffy modelmodelos Logístico; Gompertz; Bertalanffy; curvas de crescimentoFive nonlinear models were fitted to weight-age data from birth to 168 days collected in 127 Large White and 143 Landrace pigs, tested at Concórdia, SC, Brazil, during 1979 and 1980. The purpose of this experiment was to determine the best equation for fitting, computacional ease and biological interpretability of the parameters. The pigs were fed from 76 to 114 days with a ration containing 3,300 kcal/kg GE and 18% crude protein, and from 114 to 168 days a finishing ration with 3,250 kcal/kg GE and 16% crude protein. Both feed and water were available ad libitum. Weight data at birth at 21 days, and weekly from 60 to 168 days were used to fit the models. Based on the adjusted coefficient of determination (R2), residual mean squares and biological interpretability of parameter fitted, the Logistic model with variable inflection point in M, provided the best results for the present study. Two models provided poor estimates of observed weights both in the initial and final phase of the studied period. The highest rate of maturity was provided by the Logistic model. All models showed good adjustment. The best results were obtained with male swine independently of race.Cinco modelos não-lineares foram ajustados a dados de peso-idade, do nascimento a 168 dias, de 127 suínos Large White e 143 Landrace submetidos a teste de desempenho, em Concórdia, SC, no período de 1979/80. O objetivo foi selecionar o modelo mais adequado ao ajuste, facilidades computacionais e interpretabilidade biológica dos parâmetros. Os animais receberam ração e água à vontade. De 76 a 114 dias, foi ministrada ração com 3.300 kcal/kg de energia digestível (ED) e 18% de proteína, bruta (PB); de 114 a 168 dias, ração com 3.250 kcal/kg de ED e 16% de PB. Dados de peso-idade ao nascimento, aos 21 dias e, semanalmente, dos 60 aos 168 dias, foram utilizados no ajuste. Baseado nos valores do coeficiente de determinação corrigido (R2), quadrado médio residual e interpretabilidade biológica dos parâmetros ajustados, o modelo Logístico, com ponto de inflexão variável em M, apresentou os resultados mais adequados para este estudo. Dois modelos mostraram estimativas pobres dos pesos observados na fase inicial e final do período estudado. A maior taxa de maturidade foi obtida com o modelo Logístico. Todos os modelos apresentaram boas características de ajustamento. Os melhores resultados foram obtidos com suínos machos, independentemente de raças.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraFreitas, Alfredo Ribeiro deCosta, Cláudio Nápolis2014-04-16info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/15452Pesquisa Agropecuaria Brasileira; v.18, n.10, out. 1983; 1147-1154Pesquisa Agropecuária Brasileira; v.18, n.10, out. 1983; 1147-11541678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAporhttps://seer.sct.embrapa.br/index.php/pab/article/view/15452/9372info:eu-repo/semantics/openAccess2014-04-16T18:43:05Zoai:ojs.seer.sct.embrapa.br:article/15452Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2014-04-16T18:43:05Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false |
dc.title.none.fl_str_mv |
The fitting of nonlinear models to growing pigs data Ajustamento de modelos não-lineares a dados de crescimento de suínos |
title |
The fitting of nonlinear models to growing pigs data |
spellingShingle |
The fitting of nonlinear models to growing pigs data Freitas, Alfredo Ribeiro de growth curves; Logistic model; Gompertz model; Bertalanffy model modelos Logístico; Gompertz; Bertalanffy; curvas de crescimento |
title_short |
The fitting of nonlinear models to growing pigs data |
title_full |
The fitting of nonlinear models to growing pigs data |
title_fullStr |
The fitting of nonlinear models to growing pigs data |
title_full_unstemmed |
The fitting of nonlinear models to growing pigs data |
title_sort |
The fitting of nonlinear models to growing pigs data |
author |
Freitas, Alfredo Ribeiro de |
author_facet |
Freitas, Alfredo Ribeiro de Costa, Cláudio Nápolis |
author_role |
author |
author2 |
Costa, Cláudio Nápolis |
author2_role |
author |
dc.contributor.none.fl_str_mv |
|
dc.contributor.author.fl_str_mv |
Freitas, Alfredo Ribeiro de Costa, Cláudio Nápolis |
dc.subject.por.fl_str_mv |
growth curves; Logistic model; Gompertz model; Bertalanffy model modelos Logístico; Gompertz; Bertalanffy; curvas de crescimento |
topic |
growth curves; Logistic model; Gompertz model; Bertalanffy model modelos Logístico; Gompertz; Bertalanffy; curvas de crescimento |
description |
Five nonlinear models were fitted to weight-age data from birth to 168 days collected in 127 Large White and 143 Landrace pigs, tested at Concórdia, SC, Brazil, during 1979 and 1980. The purpose of this experiment was to determine the best equation for fitting, computacional ease and biological interpretability of the parameters. The pigs were fed from 76 to 114 days with a ration containing 3,300 kcal/kg GE and 18% crude protein, and from 114 to 168 days a finishing ration with 3,250 kcal/kg GE and 16% crude protein. Both feed and water were available ad libitum. Weight data at birth at 21 days, and weekly from 60 to 168 days were used to fit the models. Based on the adjusted coefficient of determination (R2), residual mean squares and biological interpretability of parameter fitted, the Logistic model with variable inflection point in M, provided the best results for the present study. Two models provided poor estimates of observed weights both in the initial and final phase of the studied period. The highest rate of maturity was provided by the Logistic model. All models showed good adjustment. The best results were obtained with male swine independently of race. |
publishDate |
2014 |
dc.date.none.fl_str_mv |
2014-04-16 |
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/15452 |
url |
https://seer.sct.embrapa.br/index.php/pab/article/view/15452 |
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/15452/9372 |
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.18, n.10, out. 1983; 1147-1154 Pesquisa Agropecuária Brasileira; v.18, n.10, out. 1983; 1147-1154 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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1793416712074297344 |