My chickens are free ranged and they have lice. I have tried putting DE in their dusting holes but when they see the white stuff laying there, they go and dust in another spot and avoid this one. So now I have to dust them individually which defeats them self-administering. I have been dusting them every week with DE for the past month now and they still have lice so now its on to the sevin dust. Has anyone tried Ivemectrin on their chickens? You give it to them orally. I am wondering if I should try this...