Health FAQ

• Horses with n/n genotype are not afflicted with PSSM and cannot transmit the  variant to their offspring.    
• Horses with n/PSSM (any variation)  genotype will have the PSSM variant and may show signs of the disease. Horses with this genotype may transmit the PSSM variant to 50% of their offspring.   
• Horses with PSSM (any variation)/PSSM (any variation) genotype are homozygous for the PSSM variant listed and may be more severely affected than n/PSSM horses. Horses with this genotype will transmit the PSSM variant to all of their offspring.

Please contact the owner directly or AMHA for more information.

"Type 1 Polysaccharide Storage Myopathy is a glycogen storage disease that results in the accumulation of abnormal complex sugars in muscle cells, which can lead to muscle pain, weakness, and reluctance to move."  ~ UC Davis https://vgl.ucdavis.edu/test/pssm1 

"Polysaccharide Storage Myopathy (PSSM1) is a dominant autosomal hereditary condition that can cause a genetic form of tying-up with muscle damage and inability to move." ~ Animal Genetics https://www.animalgenetics.us/equine/genetic_disease/PSSM.asp

"There are cases of PSSM that are not associated with the GYS1-R309H variant. These cases are referred to as PSSM Type 2. The genetic basis of PSSM2 is under investigation. There appear to be multiple genetic causes of PSSM2 in different breeds." ~ Equiseq http://www.equiseq.com/learn_pssm2

Anyone who is the horses' owner at the time the test was done may submit horse test results to the site.

Yes, Simply fill in the submit my horse form and say no to the public share question.

All tests on the website are public domain.  The results are stored on the website hosting servers and a backup is preserved by the administrator.