They still can't go to Kennywood. They never win the lottery. Needed was some testimony from a leading cow psychologist. One factor, though, is the presence of the stress hormone cortosol. It's been measured in various trials to determine the pain levels of animals during certain surgical procedures, the results leading to different techniques relating to anesthesia.
Animals tend to produce and perform best when they are under the least amount of stress.
It applies to racehorses, hunting dogs, just about everything. Cows produce more milk and better quality milk when they're in more comfortable surroundings and are treated well. Production per cow is at an all-time high, according to Dr. Jarrett. A typical contemporary cow produces three times the milk of the 1940 model. Moreover, there is no evidence that mechanical milking and other technology such as electronic earrings used to monitor individual cow health have pumped up cow stress.