BSK;
Deer don't have a set type of bacteria that are designed to digest certain foods. Ruminants are so successful because the bacteria develop in the their warm and comfy stomach's to digest whatever they eat. If a deer that has been eating brouse (tree limbs) fills up with corn it will starve until the bacterial population develops to digest corn. Cattle will eat anything a deer eats and visa versa.

I looked after a waste water treatment plant for 8 years. If you gave me enough time and storage capacity I could build bacterial populations that would digest almost anything.

Dan O.