I've got a 17 month 700# Brangus heifer that just won't leave this new Simmental cow I just bought alone. I got the Simm. about a month and a half ago and no one messed with her. She is supposed to calve this month and all of the sudden this heifer is constantly trying to nurse off of her. Is this ok or should I do something about it. I've had the Brangus heifer since she was a year old and she was totally weaned when I got her.