Yes,I have 4 adult roosters and every once in awhile one will have a couple of spots on their comb like maybe they fought, but I've never seen it happen, and we've had no actual injuries...they all know the big orange rooster is the boss... and there's no trouble. Every once in awhile the big roo will charge after one of the others for messing with "his" ladies... but nothing serious. I'm not sure what makes some fight and some not. But some do and some dont. Are your chickens penned? Because penned chickens are more likely to get into full on fights
They are kept in separate coops with runs. They have a lot of space to get away from each other but that doesnt help. I tried to let them free range together but they fight even then. They also fence fight.
Marie