I'm new to chickens, we have 11 chickens, 3 are roosters and the rest are hens. All raised together. The roosters all get along reasonably well, there is a pecking order but no fighting. They are 18 to 20 weeks old. This week the dominate roo has started picking on and attacking one hen. He won't let her in the coop, chases her away from the water etc.
seems worse in the evenings I assume because she's trying to enter the coop. I've broke up attacks the last two night. I have noticed she seems to favor, meaning hang with another roo and not the dominate one about half the time. Could is be the cause of the aggression? None of the roosters are people aggressive, but this one hen is in a living hell. The hen also is the most friendly to humans. Any thoughts on what to do to stop the attacks? I'd hate for her to get seriously hurt but I do like having roosters (I like the crowing) and they're very pretty birds.