GBED stands for Glycogen Branching Enzyme Deficiency - it is a recessive disease Genetic Testing is Available
GBED manifests with stillbirths and spontaneous abortions, and cardiac or respiratory failure, seizures, muscle weakness, and sudden death or euthanasia in foals under 18 weeks old. Most GBED foals die before they are born and if they are born alive they rarely last past 8 weeks. There is no treatment.
GBED is a required test for Quarter horse stallions (part of a required 5 panel of tests). GBED is traced back to Zantanon and particularly his son King.