I have 2 horses, one of whom has chronic laminitis, so feeding her can be a challenge. My vet did say that as long as I keep her weight as low as it is, she shouldn't have problems with forage, but I am still overly cautious about NSC levels. Obviously the best thing is to send a sample of the hay I'm interested in to Dairy One and get the actual NSC level, but I'm curious about it in general before I buy some and pay for analysis.
Adding that I've got 75 bales alfalfa and 120 bales grass mix already, so this would not comprise her entire diet. I'm short maybe 50 bales to safely get through to next fall.