Todd
The Old Man tried them out a few years back, not much success. As I recalled they didn't grow well though, so that may have been the problem moreso than getting the deer to eat them. Also getting reasonably priced seed was nigh onto impossible. I remember him working the phones several months to try to get cheap seed. The only brassicas he fools with now are turnips and other than that its beans, corn, medium red clover, and some forage oats. You may have better luck growing them up there than he did, though.
Also, with the amount of acreage of stuff he puts out there is no way he could afford the high dollar "deer food" companies other than some forage oats so the name brand "deer food" seeds don't make it to the farm.
As far as the turnips went it took a year for the deer to figure out they were edible, since then they eat'em up. The first year, though, you could smell the rotten turnips in the food plots from a mile away in the Spring!
By the way, how did the dog tracking go last year?
Ryan