When I say 'raw' I mean picked fresh off a tree.
Anything thing you get at a store for human consumption will be roasted or blanched since raw nuts tend to be bitter. In nature, these bitter compounds and enzymes help the seed last until spring without going rancid or sprouting too soon.
I have several black walnut trees on my proprty as well as hickory, butternut, and oak and our tamworth hogs love to go into the wood lot and clean up the nuts in the fall with out any negative effects, but I don't know if they are picking and choosing what to eat. When we harvest for ourselves we always roast them on the woodburning stove, just enough to get the shell to crack open, and eat the still moist nut meat but they do not store well unless raw or roasted until they are dry and crunchy.
