Data/hora: 09/06/2024 07:08:43

Biblioteca(s): | Embrapa Agricultura Digital; Embrapa Amazônia Oriental; Embrapa Gado de Corte; Embrapa Pecuária Sudeste.
Data corrente: | 29/12/2016
Data da última atualização: | 30/03/2017
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.
Título: | Parametrization of the Davis Growth Model using data of crossbred zebu cattle.
Ano de publicação: | 2017
Fonte/Imprenta: | Scientia Agricola, v. 74, n. 1, p.8-17, Jan./Feb. 2017.
DOI: | http://dx.doi.org/10.1590/1678-992X-2015-0284
Idioma: | Inglês
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.
Palavras-Chave: | Asymptotic distribution; Calibração; Calibrating; Cattle growth; Crescimento do gado; Distribuição assintótica; Equações diferenciais ordinárias; Modelo de crescimento; Nonparametric bootstrap; Ordinary differential equations.
Thesagro: | Ácido nucleico; Agricultura; DNA; Gado zebu; Modelo Matemático.
Thesaurus Nal: | Beef cattle; Cattle; Mathematical models; Zebu.

Categoria do assunto:

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L Ciência Animal e Produtos de Origem Animal

URL:

http://ainfo.cnptia.embrapa.br/digital/bitstream/item/152540/1/AP-parametrization-Biase.pdf
http://ainfo.cnptia.embrapa.br/digital/bitstream/item/165135/1/Parametrization-of-the-Davis-Growth-Model.pdf

Registro original: | Embrapa Agricultura Digital (CNPTIA)

Exemplares:

CNPTIA - (18968-1) - UPC - AP - DD -  -  -  - DIS
CPATU - (53122-1) - UPC - AP - DD -  -  -  - DIS
CPPSE - (23997-1) - UPC - AP - DD - PROCI-2016.00222 - BIA - 2017.00079 - DIS
CNPGC - (16880-1) - UPC - AP - DD -  -  -  - DIS