My co-op is getting barred rock chicks in tomorrow and I would like to add about 6 of them to my world. My incubator hatch is due on the 18th. I have about a dozen of them in there that are so far viable. I only have one brooder (a large wire dog kennel). Can I mix the two ages in one brooder? I figured for the first day or so after hatch to keep them all seperate, but will they be fine after that? When I planned the hatch the co-op was getting chicks later and closer to my hatch.