Adjustment of growth parameters for the major body components of pullets

ABSTRACT The purpose of this research was analyze the fit of Gompertz function with or without fixing some of the parameters to describe body growth and major bodily chemical constituents of growing pullets. Weekly, data of body weight and chemical components of body free of feathers and feathers we...

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Main Authors: Edney Pereira da Silva, Nilva Kazue Sakomura, Juliano Cesar de Paula Dorigam, Euclides Braga Malheiros, Nelson José Peruzzi
Format: Article
Language:English
Published: Universidade Federal do Ceará 2016-09-01
Series:Revista Ciência Agronômica
Subjects:
Online Access:http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902016000300572&lng=en&tlng=en
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author Edney Pereira da Silva
Nilva Kazue Sakomura
Juliano Cesar de Paula Dorigam
Euclides Braga Malheiros
Nelson José Peruzzi
author_facet Edney Pereira da Silva
Nilva Kazue Sakomura
Juliano Cesar de Paula Dorigam
Euclides Braga Malheiros
Nelson José Peruzzi
author_sort Edney Pereira da Silva
collection DOAJ
description ABSTRACT The purpose of this research was analyze the fit of Gompertz function with or without fixing some of the parameters to describe body growth and major bodily chemical constituents of growing pullets. Weekly, data of body weight and chemical components of body free of feathers and feathers were collected from 1,200 chicks of four laying strains (Hisex Brown, Hisex White, Hy Line Brown and Hy Line White W36) until 18 weeks of age. The variables were subjected to two adjustments fixing, or not, some parameters of Gompertz function. The allometric model parameters were calculated for the chemical components. The lipid and protein composition of the body free of feathers were the components with the biggest change in the last weeks. Moreover, the chemical composition of the feather showed small variation. The parameters of the Gompertz function assumed values according to the employed adjustment, especially for protein and fat of the body free of feathers carcass. The adjustment of the Gompertz function by fixing the two parameters allowed coherence and biological significance. The allometric coefficients indicate that as the protein weight increased, the proportion of fat increased and the proportion of water and ashes in the body decreased. The fit of the model allows setting the parameters with consistency and biological significance without losing accuracy in the estimates.
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spelling doaj.art-e1472927dcc742d6b6e2ae2dda6e55682022-12-21T18:27:39ZengUniversidade Federal do CearáRevista Ciência Agronômica1806-66902016-09-0147357258110.5935/1806-6690.20160069S1806-66902016000300572Adjustment of growth parameters for the major body components of pulletsEdney Pereira da SilvaNilva Kazue SakomuraJuliano Cesar de Paula DorigamEuclides Braga MalheirosNelson José PeruzziABSTRACT The purpose of this research was analyze the fit of Gompertz function with or without fixing some of the parameters to describe body growth and major bodily chemical constituents of growing pullets. Weekly, data of body weight and chemical components of body free of feathers and feathers were collected from 1,200 chicks of four laying strains (Hisex Brown, Hisex White, Hy Line Brown and Hy Line White W36) until 18 weeks of age. The variables were subjected to two adjustments fixing, or not, some parameters of Gompertz function. The allometric model parameters were calculated for the chemical components. The lipid and protein composition of the body free of feathers were the components with the biggest change in the last weeks. Moreover, the chemical composition of the feather showed small variation. The parameters of the Gompertz function assumed values according to the employed adjustment, especially for protein and fat of the body free of feathers carcass. The adjustment of the Gompertz function by fixing the two parameters allowed coherence and biological significance. The allometric coefficients indicate that as the protein weight increased, the proportion of fat increased and the proportion of water and ashes in the body decreased. The fit of the model allows setting the parameters with consistency and biological significance without losing accuracy in the estimates.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902016000300572&lng=en&tlng=enCarcaçaCurva de CrescimentoPeso proteicoPenas
spellingShingle Edney Pereira da Silva
Nilva Kazue Sakomura
Juliano Cesar de Paula Dorigam
Euclides Braga Malheiros
Nelson José Peruzzi
Adjustment of growth parameters for the major body components of pullets
Revista Ciência Agronômica
Carcaça
Curva de Crescimento
Peso proteico
Penas
title Adjustment of growth parameters for the major body components of pullets
title_full Adjustment of growth parameters for the major body components of pullets
title_fullStr Adjustment of growth parameters for the major body components of pullets
title_full_unstemmed Adjustment of growth parameters for the major body components of pullets
title_short Adjustment of growth parameters for the major body components of pullets
title_sort adjustment of growth parameters for the major body components of pullets
topic Carcaça
Curva de Crescimento
Peso proteico
Penas
url http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902016000300572&lng=en&tlng=en
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AT euclidesbragamalheiros adjustmentofgrowthparametersforthemajorbodycomponentsofpullets
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