Pigs played a very important role on a dairy farm in the 1920s. After a farmer milked his cows, he would let the milk settle and it would separate. The cream of the milk would rise to the top of his bucket, while the skim milk would fall to the bottom. Today we can find both of these items at the store, but in the 1920s no one liked skim milk and the farmer needed a way to get rid of it.
Pigs aren't very picky eaters, in fact they like to eat almost anything. So, the pigs ate up all of the skim milk for the farmer, and he took the leftover cream to sell. What kind of milk do you drink at your house today?