Is dusting for lice and mites something that I should do regularly, as a preventative method...or just something that should be done when there is evidence that lice or mites are present? If I should be dusting routinely, what should I use and how often? I have 6 hens and a rooster; they have a coop, but they also free-range quite a lot. I've tried finding another thread to answer my own question, but wasn't having any luck...only finding what to do once an infestation has already occurred. Thanks!