lice!!!!

I have read that many people dust the birds with sevin dust to get rid of them. You can put it in a nylon stocking and holding the bird upside down gently dust the underside and vent area very well. You will need to reapply in about 10 days to get any new hatched lice. Make sure to get under the wings and the vent area since lice love it there. Be careful not to get it in the eyes as it is a pesticide. Having a second person there to help handle the bird might be a good idea since they could also help protect their eyes and noses.
There are poultry dusts for chickens but they are more expensive and have the same active ingredient as Sevin. I have also seen that many many people use DE in the dust bathing area and under the roosts to help eliminate lice.
I would clean the coop/s very well before I treat the birds and again after the second treatment.
WEAR A DUST MASK. I cannot stress this enough. Both DE and Sevin are very fine powers and VERY irritating to the lungs.

I am sorry you are having troubles. I do hope this helps.

 

Have you wormed your chickens lately? The reason I asked is because if
you worm with ivermectin topically ( pour on used on the skin) it will also kill mites. You will still need to treat you coops.