Should a rooster group be limited to a certain number? Is it ok for the group of males to be in a run thats connected to a run of pullets? Could this cause more fights? At what age should a cockerel be allowed to join? Or is size the most important factor?
I don't think the number matters that much, as long as the coop is big enough for the number of roosters you have. Also, a rooster flock of two is more prone to bullying than a rooster flock of three. Yes, it is possible that a connected run could encourage the roosters to fight more, but it shouldn't be too bad as long as they have lots of space to get away from each other. I think the time when you introduce new cockerels does depend more on size/maturity rather than age. 3-6 months is a good age range to introduce new cockerels.