Possible Clues:

• The swine are going to have what's in the trough
• The testament of the swine is in the trough
• The swine are going to get it from the trough
• Scraps of food and litter to leave
• The swine'll take it
• Gourmands are going to take left-overs
• Refuse to go into a filthy place?
• Leftover food for the sty
• Self-control lagging, greedily eats waste food
• Kitchen waste used as animal feed