I have a buddy that plants sugar Beets most years on his farm. The Deer don't seem much interested. They will browse along the verge, bushes and Rye, but don't seem drawn to Beets.

They hit the winter Rape hard, in the winter when it is young and then again later after it matures and makes seeds.

I've had good luck with Corn, I let it grow, dry on the stock and let it fall where it may. Deer seem to hang around those plots all year. Either feeding off the young plants or the Corn kernels on the ground.