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Standardizing near infrared reflectance spectra by detrending against a water spectrum, for calibrating the voluntary intake of barley straw by sheep

Published online by Cambridge University Press:  27 February 2018

A. V. Goodchild  and
F. J. El Haramein
A. V. Goodchild
Affiliation:
International Centre for Agricultural Research in the Dry Areas, PO Box 5466, Aleppo, Syria
F. J. El Haramein
Affiliation:
International Centre for Agricultural Research in the Dry Areas, PO Box 5466, Aleppo, Syria
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Extract

The moisture content of samples affects the accuracy of predictions made using near infrared reflectance spectroscopy (NIRS). One way to prevent the problem is to develop a repeatability file, which summarizes variation in the spectra of a single sample resulting from variation in conditions at the time of scanning (Murray, 1993). Another method is to re-read the spectra of all samples on a second occasion when their moisture content has been deliberately altered (Murray, 1993). The present study, using straws with known voluntary intakes, compares these methods with a simple technique that compensates the spectra for moisture content before NIRS calibration (or prediction) begins.

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BSAP Occasional Publication , Volume 22: In vitro techniques for measuring nutrient supply to ruminants , 1998 , pp. 315 - 318
Copyright
Copyright © British Society of Animal Science 1998

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References

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