I started with 6 started pullets first (July '07). I ended up putting their coop in the back of my hay shed. Then after a few months ordered some hatching eggs (the first of them hatched 1 yr ago today). I decided to get a separate coop for them rather than try to integrate 19 chicks in with the big girls (by this time I only had 5 pullets). I was able to use the new coop as the brooder for the chicks which worked out really well.
It was probably March or April before I started letting the "kids" out of their coop, initially in fenced area, then free-range. By this time I was down to 10 after giving away the extra cockerels. Once they were out in the real world and encountering the big girls (down to 4) there were only a few pecking order issues to be ironed out between them.
Here we are the kids' first birthday and 2 of the girls have taken up residence in the big girls' coop. They spent the first few nights on the lower roosts, but now get to share the highest roost with the others. During the day the poor rooster has to watch over all 12 hens. It's quite a sight to see them cruising around the yard together.
All that to say, your plan to have separate accommodations for the separate flocks is a good one, though given time and opportunity they'll integrate themselves.
It was probably March or April before I started letting the "kids" out of their coop, initially in fenced area, then free-range. By this time I was down to 10 after giving away the extra cockerels. Once they were out in the real world and encountering the big girls (down to 4) there were only a few pecking order issues to be ironed out between them.
Here we are the kids' first birthday and 2 of the girls have taken up residence in the big girls' coop. They spent the first few nights on the lower roosts, but now get to share the highest roost with the others. During the day the poor rooster has to watch over all 12 hens. It's quite a sight to see them cruising around the yard together.
All that to say, your plan to have separate accommodations for the separate flocks is a good one, though given time and opportunity they'll integrate themselves.