Lobi is correct.

It is used primarily for horses and I used it to pull deer "next door" from corn piles. I never had any luck with 10 or 12% sweetfeed only 16 and 20% sweetfeed seemed to work!

Use some Whitehouse 100% pure apple juice and pour over your corn pile if the sweetfeed doesn't work. Or use sweetpotatoes. Deer also love peanut butter in the jar. Poke a hole in the jar lid, nail about 4' off the ground to a tree then screw the jar back on the lid and cut off the bottom of the jar so the deer can get to it. It may take them some time to find it if that is all you use, but man, I have see does/bucks actually tear the jar off the tree getting to it.
I've had some luck with DeerCane blocks as well, however salt worked just as good if I dug a hole and poured water over the saltblock. The deer tore up the ground all around the salt before actually licking the salt block.

As stated before cabbage works well too.