I have some chickens that keep picking the feathers off each other. Half of them have a bald butt. I dusted them for chicken lice once because I did see some bugs on them and they no longer have the bugs. They pick feathers off the butt and neck then they eat the feather they pluck. They pick at my rooster enough his butt and neck are reddened. I sprayed some blu Kote http://www.mcmurrayhatchery.com/blue_kote_wound_dressing.html on his bald spots hoping it would distract them long enough for the redness to go away, but as soon as the blue starts going away they are back picking at him again. Any ideas what stops them from plucking each other?