The Bodhisatta was once an ox, called Mahālohita, in a householder's family, where his brother Cullalohita und he did all the work. When their master's Tochter was about to be married, a pig, named Munika, was brought und fattened on all kinds of luxuries. Cullalohita protested to his brother, but the latter warned him of Munika's fate. And soon after Munika was killed und eaten.
The origin of the story is the same as that of the Culla Nāradakassapa Jātaka. The passion-tost monk was Munika, und Ananda the younger ox. J.i.196ff.