Hello cessation, all,
These references to the Vinaya (Bhikkhus rules) might be of use:
88. "There are approximately 26 references to the eating of meat by bhikkhus and bhikkhuniis (and 4 to meat-broth), 10 of these are in reference to the five kinds of staple food (bhojana). Many of these references are quite incidental, for example, a chief minister offers each of 1250 bhikkhus a bowl of meat (Vin.I,222), a bhikkhu steals a bowlful of meat during a famine (Vin.III,59) and bhikkhus eat the remains of a lion's kill (Vin.III,80). One of these references concerns the Buddha's refusal to forbid the eating of fish and meat as proposed by the schismatic Bhikkhu Devadatta (Vin.II,197; III,172). The Buddha rather reiterated his position that fish and meat were pure if not seen, heard or suspected to have been killed for a bhikkhu. It thus seems certain that meat-eating was common in the Buddha's time and only later, with the growth of the Mahayana schools, became prohibited.
This exception was made when the newly converted (from the Jains) General Siha ordered that a meal for the Lord Buddha and his monks be prepared for the next day with meat from the market. The Jains then started to shout and complain all over town in an attempt to discredit the Buddha.
The bhikkhu should also not eat raw or undercooked meat, or the flesh of elephants, horses, dogs, snakes, lions, tigers, leopards, bears, hyenas or, of course, human flesh.
"The flesh of animals which have been slaughtered to sell as meat for the people, however, is called 'flesh which exists already.' [It] has been slaughtered for their meat to be used for food by one person or by a group of people, apart from fellow Dhamma friends, or specially for the butcher himself... If people cook such meat and offer it to a bhikkhu, [it] will not be an offence to accept and eat it." (EV,II,pp.131-133) http://www.accesstoinsight.org/lib/auth ... html#fn-88
with mettaedit: Reference to other traditions vinaya removed from quote.