J. J. C. Smart on Utilitarianism and Vegetarianism

[E]ven though they may not have the capacity for happiness and suffering that whales have, nevertheless I would suppose that chickens can suffer quite a lot, even though their consciousness should be very much a sort of daze, and this should be taken into account in our dealings with them. Perhaps in order to qualify for a moral elite one should become a heroic vegetarian like Peter Singer. I am myself not so heroic. I eat eggs though they may come from battery hens. Moreover at present I see no moral objection to eating the flesh of free range cattle, which seem to me to have a happy life which they would not have at all if they were not destined to be eaten.

(J. J. C. Smart, Ethics, Persuasion and Truth, International Library of Philosophy, ed. Ted Honderich [London: Routledge & Kegan Paul, 1984], 134 [italics in original])