I am trying to introduce 2 20 week old pullets to my 3 one-year-old hens. I got a new coop and put it in the enclosure with the old coop where the older hens sleep. I shut the pullets in the new coop for a few days. When I first let them out, the older hens were originally distracted with scraps, but soon went into the new coop and chased the pullets out. Now every time I try to let the pullets out, there is a lot of pecking. The pullets always end up in a corner of the enclosure, or on the roof of the coop, and they stay there terrified to move until I rescue them. I left them all afternoon today and they still did not venture out from their corner to scratch or explore. How long will this go on, and should I keep it to short bursts so they don't get too stressed or longer periods so they sort it out more quickly? I think it may be stressing out the older hens as well, because their egg production has decreased.