Título:	Parametrization of the Davis Growth Model using data of crossbred zebu cattle.
Autoria:	BIASE, A. G. DIAS, C. T. dos S. BARIONI, L. G. ALBERTINI, T. Z. MARTORANO, L. G. OLTJEN, J. W. LANNA, D. P. D. OLIVEIRA, P. P. A. MEDEIROS, S. R. de TORRES JUNIOR, R. A. de A.
Afiliação:	ADRIELE GIARETTA BIASE, Esalq/USP; CARLOS TADEU DOS SANTOS DIAS, Esalq/USP; LUIS GUSTAVO BARIONI, CNPTIA; TIAGO ZANETT ALBERTINI, Esalq/USP; LUCIETA GUERREIRO MARTORANO, CPATU; JAMES W. OLTJEN, University of California; DANTE PAZZANESE DUARTE LANNA, Esalq/USP; PATRICIA PERONDI ANCHAO OLIVEIRA, CPPSE; SERGIO RAPOSO DE MEDEIROS, CNPGC; ROBERTO AUGUSTO DE ALMEIDA TORRES JUNIOR, CNPGC.
Ano de publicação:	2017
Referência:	Scientia Agricola, v. 74, n. 1, p.8-17, Jan./Feb. 2017.
Conteúdo:	The system of differential equations proposed by Oltjen et al. [1986, named Davis Growth Model (DGM)] to represent cattle growth has been parameterized with data from Bos taurus (British) and Bos indicus (Nellore) breeds. The DGM has been successfully used for simulation and decision support in the United States. However, the effect of about 30 years of genetic improvement and the use of different breeds may affect the model parameter values, which also may need to be re-estimated for crossbred animals. The aim of this study was to estimate parameter values and confidence intervals for the DGM with growth and body composition data from Zebu crossbred animals. Confidence intervals and asymptotic distribution were generated through nonparametric bootstrap with data from a field experiment conducted in Brazil. The parameters showed normal probability distribution for most scenarios. The rate constant for deoxyribonucleic acid (DNA) synthesis had a minimum increase of 156 % and the maximum of 389 %, compared to the original values and the maintenance requirement had a minimum increase of 126 % and maximum of 160 % compared to the original values. Lower limits of 95 % confidence intervals for the parameters related to maintenance and protein accretion rates were higher than the original estimates of the DGM, evidencing genetic differences of the Zebu crossbred animals in relation to the original DGM parameters.
Thesagro:	Agricultura Modelo Matemático
NAL Thesaurus:	Beef cattle Cattle Zebu Mathematical models
Palavras-chave:	Asymptotic distribution Calibrating Cattle growth Nonparametric bootstrap Ordinary differential equations
Digital Object Identifier:	http://dx.doi.org/10.1590/1678-992X-2015-0284
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CNPTIA)