My new hens are red sex links and they get along great. Hardly notice any pecking order at all. The ones I had before were mixed and a barred rock was a terrible bully. She would lay into a buff's head with everything she had every time the rooster mounted her. Now the bully hen is all I have left of the old flock and she will not get along with any of the red sex links. I've kept her out of the pen all summer, gave her chance after chance and she will act ok a day or two, then I'll see her swinging that beak at the entire group! None of them will stand up to her and the rooster ignores it, so she's out. I won't tolerate her extreme aggression, so she can just free range on the outside.