We have 7 hens and 1 BR roo. They are all 15 weeks old. 2 of the hens are letting the roo mate with them. I hope eggs will follow soon. The roo is attacking one of our BO hens. She has a small pink comb as do most of the hens. He chases her and pecks her very hard once he gets her. She screams so loud and flies up into the fencing in the run. I am afraid she"ll hurt herself. He is always nice to the 2 BR hens but is frequently grumpy with the 5 BO hens. Do rooster prefer hens of their own breed and color? I know it sounds strange but he is always around one of the BR hens like they are "in love". It's crazy he hates that BO hen and she is calm and really nice just like all of them.