Hello all.. And thanks for all the info so far.. but I have another questions.. I was given 2 barred rocks and they are about a week old. The are in a seperate brooder now. Now I have 4 RIR and 4 Buff Rocks that are about 4 weeks old.. They will be going out to the coop in a week or two.. depending on weather and feather.. LOL How old should the Barred Rocks be before they can join the older chicks?