I've finally found a way to get the most food value out of the produce. The first step is to let the piglets at the produce; they eat most of the small stuff, and nibble on the bigger. We then turn the big pigs loose on it, and they eat most of the rest; with the exception of citrus fruits, raw potatoes and onions.
It turns out that the cows and sheep like what the pigs won't eat, and we're now pretty much getting 95% of each load eaten by giving each group of animals access. At the end we scoop up what's left and off it goes to the compost pile.
Pretty happy about having found a use for the citrus, most of which was making the trip to the compost pile directly, which seemed a waste. Much more satisfying to see something enjoy it. It's traveled 1,000 miles or more -- it deserves to be utilized. We've invested a lot of time and effort, as a society in it.