Mother always saved the fat from any deer or occasional bear that we got hunting while I lived on the home place. She would melt it, strain out the odd bits of meat, and pour it into sealed metal coffee cans. It lived in our root cellar, while Mother used it to make laundry soap, and we used it for greasing boots, cap and ball revolvers, and such. It never seemed to go bad. Now that I am back on a small farm of sorts, I will start saving it again from wild game or whenever I slaughter.