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The detection and measurement of mite infestation in animal feed using near infra-red reflectance

Published online by Cambridge University Press:  27 March 2009

D. R. Wilkin ,
I. A. Cowe ,
B. B. Thind ,
J. W. McNicol  and
D. C. Cuthbertson
D. R. Wilkin
Affiliation:
Ministry of Agriculture, Fisheries and Food, Slough Laboratory, London Road, Slough, Berkshire
I. A. Cowe
Affiliation:
Scottish Crop Research Institute, Pentlandfield, Roslin, Midlothian, Scotland
B. B. Thind
Affiliation:
Ministry of Agriculture, Fisheries and Food, Slough Laboratory, London Road, Slough, Berkshire
J. W. McNicol
Affiliation:
Scottish Crop Research Institute, Pentlandfield, Roslin, Midlothian, Scotland
D. C. Cuthbertson
Affiliation:
Ministry of Agriculture, Fisheries and Food, Slough Laboratory, London Road, Slough, Berkshire
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Summary

Samples of pig feed, infested to various known amounts with Acarus siro L., were scanned using an NIR analyser. Visual inspection of the spectra of infested feed did not indicate the presence of mites, but principal components derived from these spectra were correlated with the number of mites. Examination of the spectrum of Ringer solution, and of principal components for both infested feed samples and for mites scanned in isolation, indicated that in infested samples mite haemolymph caused the absorbance maximum for water to be shifted towards the visible end of the spectrum. Simpler calibration models, of the type used by current commercial NIR analysers, were developed which were able to detect and quantify economically significant levels of mites in infested pig feed.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 107 , Issue 2 , October 1986 , pp. 439 - 448
Copyright
Copyright © Cambridge University Press 1986

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