One of the questions I get pretty regularly is what I feed the pigs. Here's today's menu: Surplus/expired/wilted produce. As you can see, it's a mix of all sorts of vegetables and fruits. Pineapples, watermelons, corn, oranges, papayas, apples, and basically every other type of fruit or vegetable you'll find at a supermarket.
The pigs pick through the produce and eat what they want, the rest gets mixed with wood chips and then composted. I particularly like this sort of feed because otherwise this stuff would hit the landfill and be lost. I get 30 to 60 yards a week (a dump truck is 10 yards) of this, and it really helps to keep the feed bill lower.