I currently only have 4 older hens, but am going to greatly enlarge my flock this summer. I’m thinking of buying 11-15 new chickens, including a barred rock rooster. I’m keeping the babies in a new coop until they are big enough. However my old coop is about to fall down, and I want to introduce my old hens to the new coop and large number of new chickens. I’m not sure how to do this, I know that such a large number of young chickens can cause stress to older hens. What advice do you have on this process? Thanks so much!