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Registro Completo |
Biblioteca(s): |
Embrapa Unidades Centrais. |
Data corrente: |
18/12/2017 |
Data da última atualização: |
18/12/2017 |
Autoria: |
DEMUNER, L. F.; SUCKEVERIS, D.; MUÑOZ, J. A.; CAETANO, V. C.; LIMA, C. G. de; FARIA FILHO, D. E. de; FARIA, D. E. de. |
Afiliação: |
Leandro Félix Demuner, Universidade de São Paulo - USP/Faculdade de Zootecnia e Engenharia de Alimentos; Diana Suckeveris, USP/ESALQ; Julian Andrés Muñoz, Universidade de São Paulo - USP)/Faculdade de Zootecnia e Engenharia de Alimentos; Vinicius Camargo Caetano, Universidade de São Paulo - USP)/Faculdade de Zootecnia e Engenharia de Alimentos; Cesar Gonçalves de Lima, Universidade de São Paulo - USP)/Faculdade de Zootecnia e Engenharia de Alimentos; Daniel Emygdio de Faria Filho, Universidade de São Paulo - USP/Faculdade de Zootecnia e Engenharia de Alimentos; Douglas Emygdio de Faria, Universidade de São Paulo - USP/Faculdade de Zootecnia e Engenharia de Alimentos. |
Título: |
Adjustment of growth models in broiler chickens. |
Ano de publicação: |
2017 |
Fonte/Imprenta: |
Pesquisa Agropecuária Brasileira, Brasília, DF, v. 52, n. 12, p. 1241-1252, dez. 2017. |
Idioma: |
Inglês |
Notas: |
Título em português: Ajuste de modelos de crescimento em frangos de corte. |
Conteúdo: |
The objective of this work was to investigate adjustments of the Gompertz, Logistic, von Bertalanffy, and Richards growth models, in male and female chickens of the Cobb 500, Ross 308, and Hubbard Flex lines. Initially, 1,800 chickens were randomly housed in 36 pens, with six replicates per lineage and sex, fed ad libitum with feed according to gender, and bred until 56 days of age. Average weekly body weight for each line and sex was used to estimate model parameters using the ordinary least squares, weighted by the inverse variance of the body weight and weighted with a first-order autocorrelated error structure. Weighted models and weighted autocorrelated error models showed different parameter values when compared with the unweighted models, modifying the inflection point of the curve and according to the adjusted coefficient of determination, and the standard deviation of the residue and Akaike information criteria exhibited optimal adjustments. Among the models studied, the Richards and the Gompertz models had the best adjustments in all situations, with more realistic parameter estimates. However, the weighted Richards model, with or without ponderation with the autoregressive first order model AR (1), exhibited the best adjustments in females and males, respectively. |
Palavras-Chave: |
Autocorrelated errors; Autoregressive model; Estrutura de ponderação; Homogeneidade da variância; Homogeneity of variance; Mathematical model; Weighting structures. |
Thesagro: |
Avicultura; Modelo matemático. |
Thesaurus Nal: |
Poultry science. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/169193/1/Adjustment-of-growth-models.pdf
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Marc: |
LEADER 02309naa a2200325 a 4500 001 2082771 005 2017-12-18 008 2017 bl uuuu u00u1 u #d 100 1 $aDEMUNER, L. F. 245 $aAdjustment of growth models in broiler chickens. 260 $c2017 500 $aTítulo em português: Ajuste de modelos de crescimento em frangos de corte. 520 $aThe objective of this work was to investigate adjustments of the Gompertz, Logistic, von Bertalanffy, and Richards growth models, in male and female chickens of the Cobb 500, Ross 308, and Hubbard Flex lines. Initially, 1,800 chickens were randomly housed in 36 pens, with six replicates per lineage and sex, fed ad libitum with feed according to gender, and bred until 56 days of age. Average weekly body weight for each line and sex was used to estimate model parameters using the ordinary least squares, weighted by the inverse variance of the body weight and weighted with a first-order autocorrelated error structure. Weighted models and weighted autocorrelated error models showed different parameter values when compared with the unweighted models, modifying the inflection point of the curve and according to the adjusted coefficient of determination, and the standard deviation of the residue and Akaike information criteria exhibited optimal adjustments. Among the models studied, the Richards and the Gompertz models had the best adjustments in all situations, with more realistic parameter estimates. However, the weighted Richards model, with or without ponderation with the autoregressive first order model AR (1), exhibited the best adjustments in females and males, respectively. 650 $aPoultry science 650 $aAvicultura 650 $aModelo matemático 653 $aAutocorrelated errors 653 $aAutoregressive model 653 $aEstrutura de ponderação 653 $aHomogeneidade da variância 653 $aHomogeneity of variance 653 $aMathematical model 653 $aWeighting structures 700 1 $aSUCKEVERIS, D. 700 1 $aMUÑOZ, J. A. 700 1 $aCAETANO, V. C. 700 1 $aLIMA, C. G. de 700 1 $aFARIA FILHO, D. E. de 700 1 $aFARIA, D. E. de 773 $tPesquisa Agropecuária Brasileira, Brasília, DF$gv. 52, n. 12, p. 1241-1252, dez. 2017.
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Embrapa Unidades Centrais (AI-SEDE) |
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1. | | DEMUNER, L. F.; SUCKEVERIS, D.; MUÑOZ, J. A.; CAETANO, V. C.; LIMA, C. G. de; FARIA FILHO, D. E. de; FARIA, D. E. de. Adjustment of growth models in broiler chickens. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 52, n. 12, p. 1241-1252, dez. 2017. Título em português: Ajuste de modelos de crescimento em frangos de corte.Biblioteca(s): Embrapa Unidades Centrais. |
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