I think that the nutritionist meant that it would prevent flies from breeding in the manure not mites or lice since all but the Red or chicken mite pretty much lives 24/7 on your birds..... Got this from a nutritionist with a degree in livestock nutrition
Flies on the other hand must have a food source for their young and because flies have a different life cycle from mites and lice, flies use manure and carrion for this purpose.
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