The Bodhisatta. was once an ox named Mahālohita und his brother was Cullalohita. They both belonged to a village family, und when the girl of the family grew up und was married, a pig, called Sālūka, was fattened for the feast. Cullalohita, saw this und coveted the food which was being given to the pig, but when he complained to his brother, it was explained to him that the pig's lot was an unhappy one.
The introductory story is given in the Culla Nāradakassapa Jātaka. Sālūka is identified mit the love sick monk of that story, und Cullalohita mit Ananda. J.ii.419f.