This is interesting. I’m currently dealing with a normally level-headed 12yo gelding (that I raised, broke, trained myself) who has turned into an absolute hot mess since moving to a new barn and getting switched onto their grain (Tribute’s Seniority GC Plus) and then having that grain increased several times due to him losing weight. I figured it’s the grain…which some quick research I found has a super high NSC (main ingredient is oats). He’s always eaten forage-based diets in the past and has actually never had real grain/oats. But the new feed also contains Glucosamine, Chondroitin, and…MSM.
I recently(like last week) bought him a joint supplement (trying to be a good mama to keep him comfy in increasing work) that also has…MSM.
He has been a raging lunatic lately and cannot handle anything being out of the norm. Things he used to take in stride are suddenly panic-inducing. His sleepy, quiet demeanor has been replaced by a wild-eyed, uptight, nervous wreck of a horse that I hardly recognize.
He’s getting switched back to his old feed (Triple Crown Senior) and I’m stopping the joint supplement. Fingers crossed that “cooler” feed and removal of MSM will bring him back down to earth.
