I have a 5 month old heifer calf.....every day I usually go out and spend some time with the calves....but whenever I touch her head she nods and kind-a butts her head but she never comes forward to get me.....All the other calves with either let me touch them or they might just jump away and come back to investigate.....but is her nodding just a "natural reaction?" She is a nice looking heifer calf and I would like to keep her....