so butchering used to provide you with a whole lot less, and I was a little happy when it started to offer more as the most I usually got for wild life was ground hogs. I decided to play around with world gen settings and setup a new world, large area, several volcanos, more mega beasts, and 50 civs. This turned out to be a mistake because world gen took over 3 hours with the settings I chose it turned out to be worth it, I got an area with a large volume of gold, iron, flux, magma and elephants. I was really excited because of the lore behind elephants even though I knew they are far more harmless now, I was low on food and started to forge an xbow and steel bolts, I didn't have any one with hunter abilities so i just sent out a present and wished him luck, after 3 runs he managed to hit an elephant once, luckily a high master ambushers showed up with decent marksmanship. I immediately took the peasant off hunting, the result the hunter took down too elephants (one shotted one in the skill while the other was unconscious) I was happy with only about 4 prepared meals and dwindling food my dwarfs would not starve, I knew they wouldn't as I have seen a single hunter feed entire fortresses off of mountin goats and ground hogs. I was shocked though when they were butchered over 400 units of food per an elephant (130 units of pure meet and the rest is the extra butchering stuff you get) I had to take my hunter off of hunter, he had downed about 4 elephants and my stock piles were flooded. Although an extreme example butchering for even cattle can feed a lot (though they need to be tone down less)