You might kill some of the mites but not the mite eggs with what you have used so far. See the chart in my previous post. I gave my birds Game Bird feed which here is 20% protein. Since their feathers are made of primarily protein, I figured it wouldn't hurt them.I didn't see anything in the roost but I found 2 mites crawling out of the crack (wall). Maybe I got rid of them when I power washed and sprayed water with oil and soap ( 4x so far) every 5days. Also I've dusted DE on nest boxes, roost and run. I also made them dust bath. I put few crushed garlic in their water and garlic powder in their feed.
Maybe by the time I received the Permethrin I've killed all the mites.
Any suggestion what to give my girls to help grow new feathers? soon it will be cold here in Ontario, Canada.