I have two RIR that are almost 12 months old. I added 2 BO and 1 Barred Rock when they were 11 weeks old to the coop with the RIR. The RIR chase the three all the time and lay inside the door every night so the three younger girls can’t get into the coop. The three younger ones are 20 weeks and almost ready to lay eggs. How do I stop the RIR from being so mean. They both peck and chase the three younger ones. I am worried about the winter when they will all need to be inside the coop to sleep and keep warm.