Have had a flock for about 5 years now. 10 hens and 2 Roos. Flock has dwindled down to only 5 hens now so I got 10 hen chicks in the mail yesterday. All barred rocks. I have a 16x32 run with 2 coops inside. One coop is relatively small and is where the present flock reside. The other is about 3X bigger and will be where I will raise the littles until they start feathering out. Right now they are in the garage in the brooder/cage. my plan is, I will move them into the bigger coop when they start to get feathers and they will have their own little part of the run. @ about 2 months old I will try letting them mingle with the elder girls and see what happens. Wish me luck on the integration when the time comes!