can pssm cause a weak stifle
The prevalence of the GYS1 mutation in Belgians is as much as 50% of and 8% of the Quarter Horse-related breeds. Horses make and store abnormal muscle glycogen and cannot tolerate dietary starches and sugars. Horses with PSSM can be maintained with low-starch and low-sugar rations and precise exercise protocols. Symptoms usually begin by 2 to 3 years of age. Some horses are subclinical. Clinical signs include skin twitching, stiffness, firm painful muscles, sweating, weakness, and reluctance to move with light exercise.