I have 5 newly "weaned" chicks, 10+ young hens near laying age, and a mature flock of 10+ layers and a large red roo. They all sleep in the same hen house but when I let them out to forage they go in 3 groups. The roo runs off the new hens from the feed area and they only go to roost after he is bedded down. How can I get these groups to merge into one flock? If I remove the roo will the older and younger hens form a unit? It looks like he is keeping his group separate.