He is a double carrier and I bought 2 strwa while this info had not been released. I have not yet used him just for the fact that most of my shorthorn cows are not defect tested and I don't want a dead one. I will use them at some time, maybe on some commercial cows just to see what happens. I really like his coloring. Thats hy I bought the straws. I wanted to see how marked up his calves would be.