Well, Jackie, stalk no more! Join the conversation. I agree with others. In the case of your roo situation, get rid of them. If you want to hatch chicks, you can always get some fertile eggs from someone else. But... if you do so, have an exit plan for all those cockerels!
As for what "someone said" about a flock without a roo singleing out a weak hen to kill: that can happen even with a roo, and it's most often the roo who is the aggressor in such a circumstance. It's in the flock's best interest that all members be strong. A weak or sick member will attract predators. So, they may pick up on illness (whether structural or disease) that you or I might not see, and they will attempt to drive that hen out of the flock for the good of the rest of the flock. Since that hen is in a coop and run situation, she has no where to go... so she gets viciously attacked... blood letting leads to cannibalism. A nice sized coop and run with plenty of out of sight, multi level spaces, as well as free range time (if that's an option) will help prevent such issue from ever happening.
