During a recent visit to my inlaws, I noticed that my MIL has a rutabaga sitting on her counter that has started to sprout at the top. Can these sprouts be cut off and planted in the same way that sweet potato slips can be?
Well... you may get some root growth, and then again you may not. And you may get some top growth, and then again you may not. But you won't get a new rutabaga.
Because Rutabagas are biennials, if you plant the Rutabaga, ultimately you will get a big bushy plant and a flower stalk, and possibly seeds so that you can grow even more rutabagas.
Your MIL's rutabaga is beginning its second season of growth. The entire rutabaga can be planted in your garden. If it has not been trimmed too severely around the base it will develop roots and grow. If it grows it will develop leaves, then a large mass of yellow flowers which will later form seed pods. When the pods mature you will have an enormous quantity of seed.
So far as using that year old plant as starters for this year's crop, I don't know. I doubt it would work.