I bought 6 6 month old RIR's a week ago and they've been kenneled seperately and turned them loose with the general crowd today and they did wonderfully. a couple of my established girls challenged them but it went well. the RIR's put themselves to bed in their own kennel and in a few days I will have an area for them in main shed. I also got an orpington hen from a family that didn't want it anymore(of course, it grew up and wasn't cute) and she'll go into crowd in a week or so. chickens never stop amazing me after 8 years with them.