We have a three year old angus bull that we have had for two years. Didn't have any problems last year and the 22 cows he was with all calves within 41 days. He has been out with cows for a couple weeks now and for the first couple weeks he was fine. For the last few days he has been rough on the cows. He's with fifteen he right now and he keeps herding them to the corner. He won't let them leave the corner and if they do he runs them down and hits them with his head. He will hardly let them go to the water. Today when he started beating on a calf we got him in. Any idea why he started doing this and what are the chances he will stop? Don't really want to put him in the kill pen but I also don't want him to hurt any cows or calves.