Cereal Chem 63:155-159 | VIEW
Quality Evaluation of Distillers' Dried Grain by Near-Infrared Analysis.
C. F. McGuire. Copyright 1986 by the American Association of Cereal Chemists, Inc.
A by-product of fuel ethanol production from barley and marketed as distillers' dried grain (DDG) is fed to livestock either directly or as an ingredient in a formula feed. Samples of DDG were obtained from the Montana plants producing fuel ethanol. These samples were used to fabricate a set of calibration samples for use with near-infrared (NIR) analysis. From the fabricated calibration set, regression coefficients were obtained to provide NIR analysis of DDG for crude protein content, moisture content, and the percentages of crude fiber, acid detergent fiber (ADF), neutral detergent fiber (NDF), and amino acids. The correlations between standard laboratory values and NIR analysis values for the calibration samples were crude protein 0.966, crude five 0.964, ADF 0.911, and NDF 0.945. Amino acid correlations ranged from 0.993 for glutamic acid to 0.933 for methionine. Correlation coefficients between lab and NIR values on verification samples were protein 0.968, crude fiber 0.890, ADF 0.660, and NDF 0.627. Correlation coefficients between lab and NIR amino acid values on the verification samples range from 0.946 for alanine to 0.210 for proline. The standard error of difference between lab and NIR methods for the calibration samples was protein 1.10%, crude fiber 0.925%, ADF 1.28%, NDF 2.51%, and amino acids from 0.916 for glutamic to 0.011 for tyrosine.