Honestly if a broody hatches out some chicks I don't do anything special for them. The chicks eat whatever mom shows them and I've never once had them perish! They eat all sorts of things like grass, bugs, dirt, layer feed, bits of corn, etc. I trust their mom to know what she is doing! LOL That said, when I'm playing mom with hatchery chicks or chicks I've hatched in the incubator I give them chick starter only until they are out on their own. *Shrugs* Chicks are pretty tough and if I were you I'd let them out in the coup in a heartbeat.