An animal's welfare should be governed by five freedoms, namely, freedom from hunger and thirst, freedom from discomfort, freedom from pain, injury or disease, freedom to express normal behavior and freedom from fear and distress. If the essence of veterinary medicine is to act like a physician for animals then the profession must be vocal in opposition to production diseases, which can be prevented by changing the system of production.
Rollin, B. E. (2009, August). Veterinary Ethics and Production Diseases. In Bovine Respiratory Disease Symposium (p. 30).