I know this is from over mating. But I removed this hen from my roo over two months ago and she is still bald. When will her feathers grow back? And is there a way tostop my roo from doing this? He only does it to this hen and one other one. They are my oldest two. I've had the roo and them since a day old. I don't know why it's only these and not the other 9. Did he pick his favorites?