I think the more roosters you have, the better chance you have of them not fighting. Back when I had 30+ hens, we also had 5 roosters and they almost never fought. Right now I only have 13 hens, and I can't have more than two roosters. My two boys fight like crazy! We are actually working on building a second coop for one of my roosters so he can have his own flock and my two boys won't be able to fight anymore. Some people have good luck with only two roosters, and others, not so much. I personally have always had better experience with 3+ roosters.Do you have all of your roosters in the same area? If so, how does that work out for you? I've tried to have more than one rooster and they fought too much for my peace of mind. didn't want one to get hurt so I had to deal with that.