" What exactly is the difference between "stress" and "suffering"? From the industry's standpoint, all the difference in the world. "Stress" is a scientific and economic problem. Stress is a defect in the product, a correctable "syndrome." Stress is holding things up at the packing plant. Stress is requiring too much input in the care of the production units. Stress is costing good money, and we've got to make 'em pay.
Talk to these same folks about the pain and suffering and terror and loneliness of the creatures raised in these squalid factories, never seeing the light of day, denied company or recreation, denied the least bit of human warmth for all of Dr. Grandin's touching advice - and no, that just doesn't make sense to them. That's a lot of moralistic, anthropomorphic nonsense. "

― Matthew Scully , Dominion: The Power of Man, the Suffering of Animals, and the Call to Mercy