Buy a pair of MGR/IMGA-registered Myotonic (Fainting) goats from Silver Bridge Farm. These 1-year-old, 130 lb (combined) goats carry myotonia congenita — the harmless muscle-stiffening gene that makes… this the most viral and widely shared goat breed online. Beyond viral fame, Myotonics are the most muscled meat breed per pound of frame, producing premium goat meat. CL negative, CAE negative, Johnes negative, Scrapie negative. CDT current. Calm temperament — excellent for agritourism operations, petting zoos, schools, and film. High demand continues to grow.