Not me!!! 3 sets last year. Multiple rants on this forum.Twinning is definitely genetic. Once bought a simmental heifer. Had twins the first time. Single the next time. Twins the next two times. Had 7 calves by the time she was 5 years old. Certainly a record in my experience. Sent her down the road. For me twins usually are smaller, grow off slower, require additional care and labor and pull the cow down. Some people welcome them, have two big calves that the cow accepts and both wean heavy, and cow breeds back on time. I would rather have singles.