farmgal - is there a reason you need a rooster? I'm not sure where you are located, but with winter coming I wouldn't want my girls having bare backs. I had 8 hens to 1 rooster and it was still far too much mating for the girls. The problem was he seemed to have his favorites - some that he would mate all the time and others he never touched. The aggression is something I do not put up with in roosters either, so I personally would cull them. You don't want someone to get injured. I know it is hard to kill an animal, but I think of it this way - you have given them a really good life and can give them a humane ending while preserving the health of your girls. Think of how lucky they are compared to the roosters born in the hatcheries!