I knew that, and this stuff looks really lean. Last batch I used really fatty bacon ends I can get (uncured). My younger brother said he loved it.Your also gonna need about 15lbs of pork butt to mix in with it. Trust me on that. Not enough fat in the deer meat to make a decent sausage!
I've been known to use beef suet as well, just tough on the grinder.
Leaving work to go find me some casings and some fat. Wish me luck!