I have 4 Buff Orpington hens and one hatched out 7 chicks a few months ago. I think they are now 3 1/2 months old. They have most of their feather. Any way, She was very protective of them when they were first born. Wouldn't let the other two hens near them, but then at around 6-8 weeks old, she wanted out of the pen. It's a big roofed chicken house/pen that's 8'x16' with only the four hens in it. So, I let her out in the day.
Now she hates her babies and chases them and picks at them. They run away from her when they see her coming and they all roost on a perch by themselves.
Why did she all-of-a-sudden, start hating her own chicks?
BTW: I think 3 are going to be roos and 3 hens and I'm undecided on the other one.