Mine as a general rule are very good natured around chicks. The way my great-uncle kept the proven broodcocks and broodhens for producing more hens on fast track to breeder pens, the cocks routinely got involved with rearing chicks. It also occurred on walks where birds were single mated. Key was exposure of cock to only one hen and her brood. Bringing a second hen / pullet into situation makes so cock has to spread his efforts out more thus he delays investment until young are juveniles. With even more hens the cock does nothing other than warn and take on hawks.