My 10 three week old pullets have next to no feathers on their backs by their rumps, due to some particularly unpleasant pecking. I put up only red lamps and moved them to a new brooder that's 5 feet by 3 feet and 3 feet tall, with lots of room to flap and roost. So, I don't think any more pecking is going on, but I'm concerned that those feathers are just not going to grow back and the poor things will be naked, cold and ugly from here on out. If they do grow back, how long does it usually take? The breeds are: Light Brahma Dominique Ameraucana Silver-Laced Wyandotte Black Australorp Thanks!