I meant a definition of "common good" from, again, a cold utilitarian POV - providing goods and services (but including decidedly social ones like child bearing, taking care of the elderly and such)
That's not what's commonly understood by utilitarianism, by the way. If said activity to render goods and services does not result in increased total happiness or average happiness, after factoring in externalities, many utilitarians do not consider that a "good" activity.
(via Wikipedia) for example, Bentham, the first formulator of says that utility is
> That property in any object, whereby it tends to produce benefit, advantage, pleasure, good, or happiness ... [or] to prevent the happening of mischief, pain, evil, or unhappiness to the party whose interest is considered.
but the question is open as to whether or not the happiness of animals is included in it. So just as exploitation of many to a great degree for services like a relatively small increase in comfort of few (as in chattel slavery) would be negative utility for Bentham, the suffering of animals for food would be considered negative utility to the utilitarian animal rights advocate.
