Validação de modelos matemáticos para predição de consumo voluntário e ganho em peso de bovinos
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Data
2011
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Resumo
We evaluated the use of equations of the
Cornell Net Carbohydrate and Protein System
(CNCPS) and National Research Council (NRC)
level 1 to predict the dry matter intake and daily
weight gain in tropical conditions of feedlot. We
used 23 crossbred steers Holstein / Zebu kept in
individual stalls with a mean age of 20 months and
260 kg live weight at the start of the experiment.
The experimental diets were isonitrogenous
composed of two levels of energy intake with 50
or 80% of concentrate in dry matter basis for
treatments medium (TM) and high (TA), respectively.
Observed variable responses between the
observed and predicted values for dry matter
intake and weight gain depending on level of
concentrate. The best estimate of dry matter
intake occurred for the treatment of middle level of
concentrate on which the regression equations
presented R2= 0.61 and 0.63 for the CNCPS and
NRC, respectively. The models were inefficient for
predicting dry matter intake in the treatment of high
concentrate inclusion and did not present accurate
prediction of daily weight gain in any experimental
conditions analyzed.
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Palavras-chave
CNCPS, NRC, Confinamento, Exigências, Feedlot, Requirements
Citação
REZENDE, P. L. P.; F. NETO, M.D.; RESTLE, J.; FERNANDES, J. J. R.; PÁDUA, J. T.; QUEIROZ, G. A. B. Validação de modelos matemáticos para predição de consumo voluntário e ganho em peso de bovinos. Archivos de Zootecnia, Córdoba, v. 60, n. 232, p. 2-10, 2011.