Thanks Jeanne. jal, that's still not enough information to give you an answer. How long is your breeding season, how many cows is this bull expected to cover, how big is your pasture? One 15 month old bull can cover probably 25 cows (I might be stretching that a bit), but if the pasture is large it's going to require a lot of traveling on his part (especially if you're expecting him to breed them in 30-60 days) and will wear him down faster so you might want to go with less cows or put in another bull in to help him. You don't want him to get so pulled down that it takes the rest of the year to recover. On the other hand, if you leave your bull with your cows year round then he could probably handle more than 25 head and not be any worse for the wear. I would also suggest having a breeding soundness exam done on this bull (if you haven't already done that) to make sure he's shooting live ammunition and is ok to breed.