Thank you for this video!! I think I know what the problem is! I have 11 chickens and about 8 of them have been affected with the mites. I have been using the diatomaceous earth but not liberally enough. Any idea of how long it will take for the chickens to grow their feathers back?
Hi @rdadams88

If they have an active infestation, it would be better to use a Permethrin based poultry dust or spray to eliminate the mites. Treat the chickens, clean out and treat your coop as well - repeat in 7-10days or follow the label on your product.
Feather loss can be caused by a number of things - if the feather shaft is still in the skin, then the feathers will not grow back until the birds molt.
http://www.backyardchickens.com/t/1151513/pesticides-approved-for-poultry