It’s no secret that most livestock on large-scale operations are treated pretty terribly. What seems to be less clear is whether happier animals—those given better food, more space, better lives—produce better food.
Some evidence indicates that keeping an animal safe and limiting its stress can lead to better-quality meat and milk; there are various scientific reasons for this which are not particularly well-understood, involving the impact of enzymes created in times of stress on muscle tissue, or, in the case of dairy cows, reducing their output of milk. One new bit of evidence is a little bit clearer, since it doesn’t actually involve making animals happier: just tricking the animal into thinking it is
Scientists at the University of Wisconsin-Madison recently published the results of an experiment in which dairy cows were injected with serotonin, a neurotransmitter usually thought to indicate, or cause, feelings of well-being and happiness. The aim was to find out what effect, if any, serotonin has on the treatment of hypocalcemia, a disorder affecting some dairy cows which can lead to reduced calcium content in milk (and thus, inferior milk, at least to the humans drinking it).