What do you add to your venison when grinding?

[buckhound]

I have found to make it less dry i mix some olive oil in or butter soaks up to help make it little moist

[Raygubernat]

My preference is pork fat, if I can get it.  Typically I have to settle for beef fat, which I add to about 20% and, after a coarse grind, I will fold in about 15-20% ground pork.   If I re-grind the mix with the ground pork in it, the resulting mixture is too fine  for me.   

RayG