Lot's of variables. I free range so I have the luxury of lots of room. When my broodies were hatching out I let the adult flock have free range over the entire property too increase separation even more. When they would roll back around to the coop there were a few minor incidents for a few days, but that did not last. I also have another young flock from the hatchery. At present, I have a flock of adults, a flock of 9 weeks olds and a smaller flock of 5 week olds, all together under the same roof and ranging together. No deaths and no injuries. However, the young ones are roosting in the nest boxes, looks like they are telling me that they want their own roost.
Mark