Cows may be at home on the Great American Plains, but they are a little big to live on board ship. I find that goats give me all the bonuses I care about with few negatives. The milk tastes good if you make sure they eat the right stuff. And they are as loving as dogs. And they make good stew when they shuffle off this mortal coil. Just never teach them to jump or they will never stop. And Billy goats pee on their goatees because they think it is sexy. I wish I was flexible enough to do that, but have it on good authority that it is not sexy at all. So no Billy goats on my ship.