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Neural network committee to predict the AMEn of poultry feedstuffs

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Abstract

A committee of neural networks is the aggregation of two or more neural networks for making overall predictions that are supposedly more accurate than those obtained by the individual networks. The objective of this paper was to assign some uncertainty over the predictions of neural networks, using a network committee to estimate the nitrogen-corrected metabolizable energy (AMEn) values of the energetic and protein concentrate feedstuffs for broilers. The dataset used to implement each expert network contains 568 experimental results. Another dataset with 48 bioassay results was used as test data. From several implemented multilayer perceptrons, the networks that presented the best generalization performance were selected to constitute the committee. The percentage of correct predictions was used as the criterion to compare committees that contained different numbers of networks. The highest probability density intervals were obtained for each feedstuff in the test data in this comparison. The estimator that ensured more accurate predictions was selected. The highest accuracy for predicting the AMEn values of concentrate feedstuffs for broilers was achieved by a committee with 1,000 networks with the use of the mode of the empirical distribution obtained from 1,000 estimated values of the AMEn. The accuracy of the models was evaluated based on their values of error measures between the observed and predicted values, in which the mode of the empirical distribution presented lower values of mean squared error (MSE = 45,285.43), mean absolute deviation (MAD = 177.66) and mean absolute percentage error (MAPE = 5.97 %) compared to the mean and the median.

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Acknowledgments

The authors gratefully acknowledge financial support provided by the Coordination Improvement of Higher Education Students (CAPES).

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Authors and Affiliations

  1. Department of Exact Science, Federal University of Lavras, P.O. Box 3037, Lavras, Minas Gerais, 37200-000, Brazil

    F. C. M. Q. Mariano & R. R. Lima

  2. Department of Animal Science, Federal University of Lavras, P.O. Box 3037, Lavras, Minas Gerais, 37200-000, Brazil

    R. R. Alvarenga & P. B. Rodrigues

  3. Department of Computer Science, Federal University of Lavras, P.O. Box 3037, Lavras, Minas Gerais, 37200-000, Brazil

    W. S. Lacerda

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  1. F. C. M. Q. Mariano
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  2. R. R. Lima
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  3. R. R. Alvarenga
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  4. P. B. Rodrigues
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  5. W. S. Lacerda
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Correspondence to F. C. M. Q. Mariano.

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Mariano, F.C.M.Q., Lima, R.R., Alvarenga, R.R. et al. Neural network committee to predict the AMEn of poultry feedstuffs. Neural Comput & Applic 25, 1903–1911 (2014). https://doi.org/10.1007/s00521-014-1680-3

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  • DOI: https://doi.org/10.1007/s00521-014-1680-3

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