It might be a nice tidbit of trivia when you bite into a sandwich or a steak.

http://en.wikipedia.org/wiki/Poultry_litter#Use_as_Cattle_Feed

Traditionally used as fertilizer, it is now also used as a livestock feed as a cost-saving measure compared with other feedstock materials, particularly for beef animals.¹ [2]. This use seems surprising to people who think of cattle as pure herbivores and natural pasture as containing nothing but herbage. In reality, natural pasture as consumed by cattle contains significant quantities of feces,insects, and other matter, while commercially grown fodder lacks this biological diversity.

There was a temporary ban in the U.S. on feeding broiler litter cattle, with the purpose of containing bovine spongiform encephalopathy (mad cow disease). The ban was announced in December, 2003, and lifted in October, 2005,³ after changes were made to the portions of carcasses that were allowed to be included in poultry feed. The concern was that infectious portions of the carcass, though non-infectious to poultry, might be passed on to ruminants that ate the poultry feed; for example, via feed spilled onto the litter.