I don't know the answer to that one either, but here's some interesting trivia next time you're at a cocktail party ...
My sister-in-law's ex was a dairyman. He had a bull called a "sidewinder". Now, I swear, this is true ... they had relocated the bull's "equipment" so it pointed out to the side, instead of in the usual direction. Then they used this sidewinder to identify cows in heat. The poor slob would mount 'em, but couldn't do much of anything about it. Talk about one of the world's worst jobs!