I have 21 adult hens. 2 of them are of little concern as they are silkies and at the bottom of the pecking order. I have 4 barred rocks. they have been in the coop for over a month seperated from the other girls. Yesterday they were let out to freerange with the older girls. It went okay. Last night I put them in nesting boxes to sleep. This morning its a lot of running and chasing. The young girls are around 12- 16 weeks. We can't remember exactly when we got them. I am thinking closer to the twelve but maybe more around 13 or 14 weeks. I am worried as we started with 5 barred rocks and one was killed. And the other times I tried putting them together there was a lot of feather pulling and some bleeding. So basically I am going down to the run like ever ten minutes to make sure everything is going okay and trying not to interfere. Is there anything I can do to make the process go a little smoother? The meanest of my hens is locked away and will be re-introduced once the babies are a little more established.