I know what you mean with an older and younger bull in with the same group of cows. Not going to do that again. They didn't hurt each other but spent more time chasing each other away from the girls that should have been spent wooing the ladies.  I appreciate the advice.

My plan had been to have each bull with a certain group in a separate pasture based on a breeding plan. Numbers don't quite work out to keep the number of cows to months of age though.