From a variety of evidence "you get to more than fifty ways of making a living in Pompeii: from weaver to gem-cutter, from architect to pastry cook, from a barber to an ex-slave woman called Nigella, who is described on her tomb as a 'public pig-keeper' (porcaria publica)."
Mary Beard Pompeii (2010) p168
Also, Roman matrons told their daughters to call their tendrest part porcellana, little piggy, hence porcelaine.
These are the only Imperial Roman Pig-Related Facts that I know, or at least that I know I know. Yet there must be more; there must be, there must be: more.