Please use this identifier to cite or link to this item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1059601
Research center of Embrapa/Collection: Embrapa Informática Agropecuária - Artigo em periódico indexado (ALICE)
Date Issued: 2017
Type of Material: Artigo em periódico indexado (ALICE)
Authors: 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.
Additional Information: 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.
Title: Parametrization of the Davis Growth Model using data of crossbred zebu cattle.
Publisher: Scientia Agricola, v. 74, n. 1, p.8-17, Jan./Feb. 2017.
Language: en
Keywords: Asymptotic distribution
Calibrating
Cattle growth
Nonparametric bootstrap
Ordinary differential equations.
Description: 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
Data Created: 2016-12-29
Appears in Collections:Artigo em periódico indexado (CNPTIA)

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