what is PSSM in horses
Equine Polysaccharide Storage Myopathy (EPSM, PSSM, EPSSM) is an inheritable glycogen storage disease of horses that causes exertional rhabdomyolysis.It is most commonly associated with heavy horse breeds and the American Quarter Horse. While incurable, PSSM can be managed with appropriate diet and exercise.SSM Type 1 (homozygous or heterozygous for the GSY1 mutation) is more common in Quarter Horses and their related breeds, and draft breeds, while PSSM Type 2 (negative for the GSY1 mutation) is more commonly seen in other breeds, including Warmbloods.