The Essence is in the Fat
In big game, especially, the strongest flavor is found in the fat of the animal. Unless you really relish the strongest of gamey flavors, it is best to trim the fat from game animals and replace it in a recipe with pork or beef fat, both of which tend to be mild-tasting. Because wild animals are quite active and develop their muscles, their meat is usually quite lean. To make sausage, you will definitely need to add fat.