Only a broody hen will accept chicks and protect them if her broody timer has gone off(sitting for at least 2 weeks). Else you risk her or non broodies just killing all the chicks. The type of chicken doesn't matter and if the broody is ready. If you don't have any broodies, regular hens will hurt the chicks. You need to raise them up to about 3 months old before they can hold their own against the older ones. Even at that, you will need to integrate them and let some pecking go on because they will have to establish their own order.