Equine Polysaccharide Storage Myopathy

quine Polysaccharide Storage Myopathy (EPSM) in Draft Horses
November 15, 1997
The following are some subtle signs that have been observed in affected Draft horses. Please indicate any that your horse may have had, with any comments that you think may be useful.

Lack of muscle mass or conditioning, especially in the shoulder or hind quarters _____

“Stringhalt”, “shivers”, or fibrotic myopathy-type gait, especially when backing or turning _____

Trembling, especially after exercise _____

Difficulty rising, backing, or reluctance to back _____

Lack of energy _____

Poor performance _____

Reluctance to pick up feet for shoeing, etc. _____

Lifting or “stomping” of hind limb or limbs, especially while standing _____

          If so, could you describe this action? 


Episodes of “colic”, especially after exercise _____

Slightly stiff or awkward hind limb gait _____

Slightly short strided hind limb gait _____

Thank you!

Dr. Beth A. Valentine
Oregon State University
Corvallis, OR 
Phone: 541 737 3261
Fax: 541 737 6817
e-mail: Beth.Valentine@oregonstate.edu