At what age does PSSM show up in horses?
At what age does PSSM show up in horses? Some horses with type 1 PSSM are asymptomatic, but most horses with the genetic defect will begin to show signs of PSSM by six years of age. Valberg cautioned that the signs of PSSM can begin as early as one year of age and as late as the mid-teens. What does PSSM N P1 mean? PSSM1 is associated with a semidominant allele of the GYS1 gene (GYS1-R309H) that has incomplete penetrance. The semidominant allele is commonly abbreviated as P1, with the recessive wild-type allele abbreviated as n. A horse with one...