Nope none of that junk works for pecking feathers. You gotta find the culprit & rearrange your pecking order. Isolate them one at a time to fixes the problem. I had this problem for over a year & ended up killing my Roo he would pick their feathers & feed them back to the girls. The flock caught on & everybody was pecking each other. It was a freaking nightmare. I also increased their protein intake to help grow their feathers back. But don't overdue the protein. I fixed the flock but its a tough battle.