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To test the hypothesis that white spots can be caused by early stages of a Psoroptes ovis infestation, cows were infested with either 50 or 200 mites at intervals of 3, 7, 10, 14 or 21 days before slaughter. White spots were detected only on blue stock hides from cows infested with both 50 and 200...

George, J. E.; Wright, F. C.; Guillot, F. S.; Buechler, P. R.
Journal of the American Leather Chemists Association, 1986, 81, 9, pp 296-304