I have 25 Red Star pullets and 26 dominique pullets, three weeks old. I kept them in groups of a dozen, give or take, in wire-covered bins in the garage, and started taking them out to "play" at a week old. They are now three weeks old, almost fully feathered, and we are building them a coop. My question is, how do I integrate them? Is it even possible to mix the two breeds? I have tried a couple times, but the Red Stars pick on the Dominiques almost right away, so I stopped trying. Any suggestions, or do we need two coops?