A relation of my wife is a canadian dairy farmer. He spends almost more of his time poring over the genetics of his cows, their productivity and exactly which sperm he will buy for her next calves.<p>It&#x27;s a major upset when a male is born (they&#x27;re killed after a few days and sold for rendering, probably for dog food.) Any sperm will get a cow pregnant, a 400$ insemination is only worth it for the potential cow sale...<p>That&#x27;s cause his biggest source of revenue isn&#x27;t the milk, it&#x27;s the cows that produce more, fatter milk than any of his neighbors&#x27; on less feed per pound of milk.<p>And so they&#x27;re inbred as hell with a handful of bulls (if that) fathering all of his cows and their mothers for multiple generations. But they sure produce a lot.