I have 4 chicks that are 8 weeks old, an easter egger, buff orpington, and 2 cinnamon queens. I live in southeast iowa. Temps are in the 30s and 40s during the day, and down into the 20s at night. Would the chicks be okay if I put them in the coop outside? Right now they are in a brooder in the garage. If I do put them in the coop can they eat layer feed or do they still need the grower feed and how do I keep them and the older hens from eating each others feed? I've never raised chicks in the fall/winter before, only in the spring.