ANALYSIS OF THE DIFASICS GROWTH CURVE OF HEREFORD FEMALES BY THE GOMPERTZ NON-LINEAR FUNCTION

Authors

  • Patrícia Neves Mendes universidade Federal de Lavras
  • Joel Augusto Muniz Universidade Federal de Lavras
  • Fabyano Fonseca e Silva Universidade Federal de Viçosa
  • Ana Rita de Assumpção Mazzini universidade Federal de Pelotas
  • Natascha Almeida Marques da Silva Universidade Federal de Lavras

DOI:

https://doi.org/10.5216/cab.v10i2.2249

Keywords:

modelo não-linear, erros auto-regressivos, heterogeneidade de variâncias

Abstract

This study had the objective to compare weight difasics Gompertz models applied in the study of Hereford females growth curves and to modeling  the errors structure inherent to each model. The non-linear difasic Gompertz growth models were adjusted with three different errors structures: independent errors (IE), first-class auto-regressive (AR (1)) and second-class auto-regressive (AR (2)) to weight-age data of 55 Hereford females, evaluated since birth till 675 days old.  The comparison between the models was carried out through on the biological interpretation basis of the parameters and in the adjustment of quality appraisers (adjusted determination coefficient, Durbin-Watson test, residual standard desviation, iterations number), beyond the Akaike information criteria (AIC) and the F test to model comparison. All studied functions, although showed good data adjustment, tend to sub estimate the adult animal weight.

KEY WORDS: Auto-regressive errors, heterogenety of variances, non linear model.

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Author Biographies

Patrícia Neves Mendes, universidade Federal de Lavras

Doutoranda em Estatística e Experimentaão Agropecuária

Joel Augusto Muniz, Universidade Federal de Lavras

Professor do Departamento de Estatística, Universidade Federal de Lavras (UFLA)

Fabyano Fonseca e Silva, Universidade Federal de Viçosa

Professor do Departamento de informática, Setor de Estatística da UFV

Ana Rita de Assumpção Mazzini, universidade Federal de Pelotas

Professora do Departamento de Estatística, UFPel, Pelotas, RS

Natascha Almeida Marques da Silva, Universidade Federal de Lavras

Aluna do mestrado em Estatística e Experimentação Agropecuária, Departamento de Ciências Exatas

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Published

2009-07-02

How to Cite

MENDES, P. N.; MUNIZ, J. A.; SILVA, F. F. e; MAZZINI, A. R. de A.; DA SILVA, N. A. M. ANALYSIS OF THE DIFASICS GROWTH CURVE OF HEREFORD FEMALES BY THE GOMPERTZ NON-LINEAR FUNCTION. Brazilian Animal Science/ Ciência Animal Brasileira, Goiânia, v. 10, n. 2, p. 454–461, 2009. DOI: 10.5216/cab.v10i2.2249. Disponível em: https://revistas.ufg.br/vet/article/view/2249. Acesso em: 21 nov. 2024.

Issue

Vol. 10 No. 2 (2009)

Section

Animal Production

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