Um. I have fed every horse I've owned Lucerne, that is breakers, yearlings, ottbs (right off the doggers truck ottbs), school horses and in the last few years, warmbloods. My coach and previous employers have always fed their school horses Lucerne, as well as their competition horses. My extremely reactive 3 yr old Hanoverian breaker is on Lucerne.
Not a peep from any of them. Lucerne is NOT a heating feed, I can assure you of that after hundreds of horses over many years!
If your vet recommended you feed a full bale per day, i don't think your horse was simply a little light on. A few days of getting some good feed, no wonder he felt pretty fresh!
In my experience, I have not seen a horse heated up by Lucerne alone - the issues have been rider issues etc. Fix that, keep horse on Lucerne and all is well.
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