I really don`t like it when they have twins but it seems we have at least one set a year since going to all Simmental. One thing I will say is they are great mothers and very fertile or this wouldn`t happen so often in a small herd of 25-30 cows. These are also the first calves out of the One Eyed Jack bull I raised. The cow is a Cowboy Cut X Yardley High Regard and she`s an excellent mother with a great disposition.