@Timmee81,
In all likelihood, the fighting you are seeing is like that shown by speckledhen. My birds are prone to take it further owing to breed they represent. I have females that do it too and treatment is the same although mother seems to suppress female expression.
The prevention I use is to place combatants in either with a fully mature rooster or a rooster that is at least 3X their size even though he is not mature himself. The bigger male will attack the aggressors each time they give the little cheaps produced when being aggressive. I make certain the larger rooster does not cause trouble in his own right which can usually be figured out in five minutes or less. Then I keep the broods in with the smaller birds until the latter are big enough to place into individual pens.
Another approach is to allow fighters to fight long enough to get sore, then split them up, but keep them in hearing an seeing range just out of reach for about 24 hours. Then put them back together. The aggression of this sort seems to be cyclical with first event occurring about time weaning occurs.
