I don't believe alfalfa is high in sugar. High in calcium and protein, yes. But I have never heard of it being high in sugar.For horses with digestive issues, usually timothy hay is by far the best. Orchard grass is good too, but has more sugar than timothy. I don't like feeding alfalfa, although many people swear by it-I think it is too high in sugar and it is technically a legume, not a grass. I personally don't feed ANY alfalfa-just timothy and bermuda grass hays. I have read that timothy is just about the ideal forage for horses' digestive systems. Also beet pulp is very good for horses.