My girls (and boy) are around 32 weeks old. We have been fighting lice for a while now. They have access to a dust area. They prefer to dig out a place in the dry dirt in the ground (i have a wash tub full of sand, DE and wood ash but they won't use it). I just sprinkle DE and Wood Ash over their favorite places. They are perfectly healthy to look at I only knew there was a problem on my monthly inspections. The bugs are long and straw colored? Lice? feathers are healthy but I'm starting to see eggs attaching to the shafts on a couple around vents. I also sprinkle DE in nest boxes and in bedding. I have tried a modest approach using Poutlry Protector spraying directly on them and spraying coop and changing bedding. No avail. I have tried manually dust bathing all of them in the sand/de/wood ash concoction. No avail. They keep coming back!!! I finally broke down and bought Permethrin 10% from Tractor supply. I mixed 1 tsp to a 28 oz bottle of water. Sprayed on their bottoms. It wasn't my first choice but it seemed better than the other alternatives. I have a couple of questions: What have you used that is safe and effective? Is there a withdrawal period for eggs? ( I contacted the Gordon USA company and the guy said "It should be fine".) Will the Permethrin also kill eggs or should I re treat in 7, 10, 14 days? I'm a newbie and extremely aggravated at this whole process. I keep a very clean coop and run and my chickens are PAMPERED. Can't believe they STILL got lice!!