I have a 7 yr old cow that I bought and she had twin heifers. I don't have much experience with twins, but the calves are now 3 months old and doing great. They are the same size of the other calves and not having any problems. My question is, Will this cow have twins every year or is this usually a one time thing? I couldn't find hardly any info on the web about cows having twins every year becasue it is genetic. Any info is appreciated.