FEATURED HORSE ARTICLES
Lessons from the Farm
What we’ve learned can help you care for your horses and return the happiness they bring you.
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.