Most people that raise Quail say not to keep the quail on the ground with the chickens. They should be is separate pens.I think quail are like turkey poults and peachicks, very susceptible to blackhead (histomoniaisis). When I let chickens raise poults and peas I treat them for blackhead before hatching.
-Kathy
@chiqita has posted about this issue so hopefully she will get back on and help with letting a chicken raise quail.