I tried rape (forgot the variety) and purple top turnips with little use here in central MO. I tried them for several years in a row. They came up great, look goodand we got the cold weather, but deer rarely used them as a food source. We do have a good supply of other food sources, as farmers tend not to plow fields in the Fall, wheat is common and there are several legume fields in the area (also plenty of oaks in the area). There are a few varieties of brassicas that have been design for grazing, that weren't out there when I gave them a go.

A fall cereal blend works well for me. Deer seem to hit this blend through out the winter.

I would ask other people in your area to see if there are local favorites that deer prefer. Or at least, I would include a mixture of brassica and cereal blend to hedge your effort.