I have 9 hens that are 7 weeks old. They are still in their broader and we are planning to put them out in their coop within the week. My friend has 5 chickens she can't keep. They are 6 weeks old. Her chickens will be going out to their coop soon also, so she will leave the 5 in the broader that I am taking. What is the best way to merge my 9 with the new 5? Do I move them all out to my coop at the same time? I really need some guidance. Thank you!