I have 4 2 yr old hens and 1 2 yo rooster, I bought 6 chicks at local farm supply this spring. They are now about 14 weeks old, fully feathered and about 2/3 as big as the smallest hen. I've had them in a separate smaller run against the side of the chicken run. The main run is 10 x 10 and the youngsters run is 3 X 8. Today I introduced them on the area outside both coops. Chicks were a little nervous and one of them tried challenging the rooster, not smart, the the least dominant hen came over to the newbys and picked a fight not to bad. I let them all free range for about 45 minutes then called the adults in and gave them some scratch, after they were in thier coop/run I chased the chicks into their smaller run. How many times do you think I need to do this before permantly putting them together? The older hens are my first effort at this chicken thing.