I have a 5 year old mare that is not a maiden. She was in heat last week and we have been hand breeding her every other day. Than I have another mare that came in heat and she is also being bred every other day to the same stallion. The 5 year old mare did NOT like this stallion and it was really difficult to hand breed her. She was last hand bred on this past Tuesday, so she will be checked today to see if she is still in. But in the mean time, she was getting real angy with the other mare after we bred the other mare to the stallion. Anyway, this morning, the 5 year old mare was mounting the other mare and she had the movement to go with it. She did this 2 times before I left for work. She should be out of her heat cycle, but I will check her this evening. Is this a dominance thing or could there be something else going on?