Heat behavior

My cow lost her calf a couple of months ago as I already talked about. She came into heat last friday which was also valentine's day so we had to get her back on track and pregnant again. The most revealing signs we saw that made us for sure that she was in heat was, walking our fence line and mooing, she did not come in and eat like she usually does, our calves started mounting each other and her vulva was reddish. When calves start mounting each other it is not sexual behavior at all, there is a sent that gets spread around when a  cow is in heat and it is just a natural reaction that they get.