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Information from Our Horse Experts

Animal experts at the Purina Animal Nutrition Center share their knowledge about horses.

What causes polysaccharide storage myopathy (PSSM) and horse tying up?
Type 1 PSSM is caused by a genetic mutation. Insufficient exercise, and a diet too high in starch and sugar and too low in dietary fat can contribute to the onset of type 2 PSSM. Currently, horses with both elevated glycogen and the abnormal polysaccharide are identified as type 1 PSSM, whereas horses with elevated glycogen stores but no abnormal polysaccharide are identified as type 2 PSSM.

Video Lessons from the Farm

Learn more horse feeding and caring tips from our Purina Nutrition Experts.

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