I realize I'm coming at this from a different angle than a lot of other HNers, but for me this is good science gone wrong.<p>Dairy cows are some of the most mistreated and unhealthy animals in the agriculture system. This push for efficiency has created a large group of animals with very little genetic diversity. They are kept on a stream of antibiotics because one bad outbreak can take down the entire group. They often develop mastitis and cancer is common by the they are 5 or 6 ("retirement age") due to poor nutrition, over-milking, and living conditions.<p>This kind of science really excites me, but the applications are almost always depressing and we should absolutely not be lauding squeezing out every last "inefficiency" in an animal based industry.