We have two, mature Chinese chestnut trees. They produce mast every year (the nut husk is covered in spikes that would make a porcupine proud). The pods pop open and drop out 3-4 chestnuts. The deer absolutely love them. We have lots of burr oak as well. I have observed deer preferentially eating hickory nuts in our hunting timber. We have smooth bark hickory around here.
I have also planted some Dunstan chestnuts, and 3 of the 4 are close to mast bearing size (took about 5 years). Dunstan's are blight resistant. American Chestnuts were all but wiped out by a blight, but a blight resistant cultivar is being worked on still. Chinese chestnuts are also blight resistant.
I think FishinRod is on to something, re: adding some forage or cover that wasn't available before helps attract more wildlife.