In my reading I've read that chickens should be regularly dusted with powder for lice and mites. Is this true? I also saw in another post about lice and mites causing death in chicks. My chicks are starting to look 'messy' and seem to scratch a lot. Is this just a process in their feathering out, or do I need to possibly treat for lice or mites? Otherwise they seem healthy. What is the process of treating for these things, and what do you use?