My Wellsummer hen just hatched out 17 guinea keets. They are all in the hen house and seem to be doing well. The hen is very attentive and doesn't let them stray too far from her before she starts clucking and the keets all run back to her. How soon do you think I could let them out into the yard? Normally I would keep them in the brooder under a heat lamp but momma hen seems to be doing a great job.