Deer in some areas do not eat brassicas, at least not right away. They may still start eating them this winter as other food sources run out (are they eating waste grain in the fields?). If they do start to eat them this winter, they will get the taste for them. As far as other options, winter rye, winter wheat, oats, and peas (preferrably a mix of 2 or more) all work well and are cheap fall/winter food.