I've been growing Teff for a few years now. I simply have not found anything better for getting green weaned calves started! If you get within 100yds of a field you can smell the sweetness, literally. The last 2 yrs here were a drought and it was the only summer crop I had that actually produced something. This year we got it out late and I hope to get 2 cuttings, If it gets cut tomorrow. When it starts getting down to 40 degree nights it pretty well stops. As far as how it compares with Bermuda I haven't a clue, my cows won't touch Bermuda.
Teff makes excellent haylage too, it packs in the bale very tightly and there is less air to destroy the hay.
I would say in a normal year that it should make close to 6 tons/ acre.
Sizmic