so not keeping but a couple or 1 or 2 each timeI don't separate my broodies from the flock for one big reason. Reintegration is a pain. My hens brood in a dog crate inside the coop. And adults don't usually bother chicks that are hatched in the flock. It's really funny to see them all gather round, cackling their heads off, as the chicks start peeping in their shells.
or every now and then should I hand them to a bird in a nest
one of my barred rock hens?