How many hens do you have? Do you have a rooster? You could keep all of the cockerels, I wouldn't if I were you though ( I would sell them and make room for some more hens!). I had 7 cockerels I was growing out until they were 15 weeks. They scuffled a bit, but nothing major. If my rooster saw the fight happening he would break it up. It also depends if you let them free range or not. Free ranging lets them have their own space if they want it and they can get away from bossy hens. Young cockerels are often the main targets for bullying for the hens
