I have a free ranging game rooster (pet lawn ornament) that sires chicks by two free ranging hens as well dominique hens for use in an experiment. He has interacted with chicks of free range hens almost from hatch and with brooder reared experimental chicks starting at 4 weeks. He helps feed the the hen reared chicks and drives off older juveniles that threaten the his hen raised bitties. The hen raised bitties seem to think highly of rooster and show no fear. The rooster beats the snott out of similar aged brooder reared chicks (also his own) whenever they get too close. Why the difference?