There are 3 popular methods, the first a salt brine with spices. The second would be using whole milk and the third, a milder brine with carrots, onions and a potato, these veg draw out the fluids along with the salt in the brine’s.
Using the acidic properties of these methods tenderizes the meat and in turn also draws out the ‘gamey’ flavor and makes the addition of other flavors much more simplistic.
These methods work well for wild deer, caribou, musk ox, rabbits, duck, pheasant, grouse and turkey’s. Also these meats, unlike commercial meats are very lean, so the addition of bacon, pork fat, salted pork fat or basting with butter aids it in flavor and tenderness in the end, high heat will do more harm than good, slow cooking it best to not dry out the meat, stewing or braising is the best, but some like game birds can be roasted, with deer depending on the cut, a slow stew in a crock pot or slow braise in the oven at no higher than 325 d F or 165 d C.