The food for farm animal for human consumption is heavily controlled. You can't give them any crap.
"poultry litter or broiler litter is a mixture of poultry excreta, spilled feed, feathers, and material used as bedding in poultry operations ... it is now also used as a livestock feed as a cost-saving measure compared with other feedstock materials, particularly for beef animals."
https://en.wikipedia.org/wiki/Poultry_litter#Use_as_cattle_f...