Growth curves for ostriches (Struthio camelus) in a Brazilian population


Autoria(s): Ramos, S. B.; Caetano, S. L.; Savegnago, R. P.; Nunes, B. N.; Ramos, Alcides Amorim; Munari, D. P.
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

27/05/2014

27/05/2014

01/01/2013

Resumo

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

The objective of this study was to fit growth curves using nonlinear and linear functions to describe the growth of ostriches in a Brazilian population. The data set consisted of 112 animals with BW measurements from hatching to 383 d of age. Two nonlinear growth functions (Gompertz and logistic) and a third-order polynomial function were applied. The parameters for the models were estimated using the least-squares method and Gauss-Newton algorithm. The goodness-of-fit of the models was assessed using R2 and the Akaike information criterion. The R2 calculated for the logistic growth model was 0. 945 for hens and 0. 928 for cockerels and for the Gompertz growth model, 0. 938 for hens and 0. 924 for cockerels. The third-order polynomial fit gave R2 of 0. 938 for hens and 0. 924 for cockerels. Among the Akaike information criterion calculations, the logistic growth model presented the lowest values in this study, both for hens and for cockerels. Nonlinear models are more appropriate for describing the sigmoid nature of ostrich growth. © 2013 Poultry Science Association Inc.

Formato

277-282

Identificador

http://ps.oxfordjournals.org/content/92/1/277.full

Poultry Science, v. 92, n. 1, p. 277-282, 2013.

0032-5791

1525-3171

http://hdl.handle.net/11449/74319

WOS:000313306700036

2-s2.0-84871489245

Idioma(s)

eng

Relação

Poultry Science

Direitos

closedAccess

Palavras-Chave #Growth #Nonlinear models #Ostrich #Struthio camelus #aging #agriculture #animal #biological model #Brazil #growth, development and aging #ostrich #physiology #Aging #Agriculture #Animals #Models, Biological #Struthioniformes #Animalia
Tipo

info:eu-repo/semantics/article