I have planted other brassicas, but really don't as much anymore because I am looking for tonnage. If you plant your brassicas late, then you run into rainfall issues for growth. If you plant them early, then you get weeds. Sugar beets fit the bill. I figure based on commercial fields that get about 20-25 tons an acre of beets. Mine were in the ball park of about 10-15 tons an acre. I had .4 acres. That is 4 to 6 tons of feed. I had some isolated beets that were over 10 pounds each! That is feed they use after the corn and beans are gone that can't be replaced by anything else. They will and do dig thru 2 foot of snow to get to them.