Sawdust is NOT mixed into cattle feed in this area of Pennsylvania. It is not a feed ingredient that is necessary as there is plenty of access to other ingredients. Pelletizing equipment is not something most local mills in Lancaster County have.
When any animal feed is pelletized, the ingredients are run through a mixer. There is no way to get a body into a mixer without it being known. Ingredients are not just brought willy nilly into a mill without records and quality control measures. These measures are in place as the feed that is being manufactured is fed to livestock that are being produced for human consumption. All feed, as well as the ingredients going into it, need to be traceable for safety and recall purposes.