We have a combination of 11 birds (all hatched this Spring in April) which include 3 Silks that are underweight, aggressive Barred Rock, Buff Orp, Easter Egg Layer, Red and Black Sex Link, 2 Rhode Island Reds and a sweet Wyandotte. Our Reds and Barred Rock are rather mean on the roosting bar at night, but they seem to work it out (nobody is roosting anywhere else). We've noticed that our Wyandotte has lots of missing/broken feathers recently. We have observed our Barred Rock and Reds are pecking and eating feathers. I read some old threads suggesting possible protein issues. We stopped chic feed and switched to layer pellet, they get whole kernel corn(with the heart), scratch and scraps from house. They have a 24x40' run, large coop(11x13'), and free range for about an hour each day. Any thoughts or recommendations would be much appreciated.