We have 10 hens and a rooster. He's general a calm rooster when it comes to use humans. He's never aggressive toward me. However, the hens look terrible. They're missing a ton of feathers on their backs. He have checked for mites and other bugs but it's not they case. It's definitely the rooster pulling the feathers out. I want to keep the rooster in a separate pen. I still want fertile eggs though. Would it be okay put a hen in the rooster pen when I want those eggs or will the rooster hurt her? The rooster pen is 3' by 6'.