I have a year old rooster and 11 chickens. He picks on my sweet cochin. To the point of trying to kill her. Shes very sweet and i dont wanna give her away. But the rooster is being a big jerk to her. But hes a good rooster to all my other girls except my barred rocks and her. What should i do? But he doesnt hurt my barred rocks the same as my sweet cochin.