Type 1 PSSM causes muscle soreness and tying up in over 20 breeds.
Type 2 PSSM can cause similar symptoms to type 1 and is more common in warmblood breeds. A muscle biopsy is required to diagnose type 2 PSSM. If a horse is N/N for the type 1 PSSM genetic test but is showing signs of muscle pain, a muscle biopsy may help to identify another muscle disorder.
To learn more about PSSM, see this list of Frequently Asked Questions. For information on genetics/inheritance and recommendations on whether to submit for genetic testing, muscle biopsy or both, please see Recent Advances in PSSM Genetic Testing.
