Farm worker Jesus Francisco Cayetano feeds pigs a slop made from food scraps from casinos near North Las Vegas, Nev. in 2006. Isaac Brekken/AP hide caption

itoggle caption Isaac Brekken/AP

These piglets on the Hardin farm in Danville, Ind., are going to cost more to feed than they will fetch at market. Dan Charles/NPR hide caption

itoggle caption Dan Charles/NPR