Years ago, farmers fed their pigs a variety of feeds as well as leftover human food, which was called slop. In time farmers learned that slop wasn't the most nutritious food for pigs. Farmers realized that better nutrition resulted in a healthier animal and better quality meat.

Do pigs actually eat slop?

Sticky or squishy mud (or food that's just about as appetizing) is slop. You'll want to wear your tall rubber boots if you're going to walk through the slop on the way to the bus stop. Farmers feed their pigs slop, a messy, wet mix of various leftovers—and when they do, they can say they slop the pigs.

What do pigs eat on a farm slop?

Common ingredients for hog feeds include wheat, corn, barley, oats and sorghum. Sorghum is a grass based substance commonly used in animal feeds and plant-based products. Feeds will also include a variety of vitamins and minerals.