I have been suspecting that one of my hens may have some mites/lice. I have not seen any but the hen scratches her head a lot, and has shown a detiororation of feathers especially at the neck, but also all over colour has become dull. This is a youngish bird, has not even layed yet. I just remembered I have a bottle of Liquid Permethrin for treating mosquito nets. Would it be a bad idea to use this on the birds? Obviously I would dilute it.