Sorry. I realized this was not very clear. They were in the house till about five or six weeks old. Then they went into the grow-out pen for about three weeks before opening the gate that separated them from the adults. By that time they were pretty good sized.I keep my littles in an adjacent pen for about three weeks. When when I open the gate and they start milling around together, they don't even seem to realize there is no separation. They are just one big happy family. No pecking, no chasing, no problems. About a week later I close the doors to their little coop/brooder so they have to roost with the big birds. Usually they roost on the floor for a while but eventually they find their way up to the actual roosts with not much trouble.