Castration is a surgical procedure to remove testicles and associated structures. Castration is also called cutting, gelding, or emasculating. The surgery is typically done on the farm, under general anesthesia, or under standing sedation.
A lot of the diseases you know of actually have a genetic basis. The 11 that are regularly tested for are Hyperkalemic Periodic Paralysis (HYPP), Polysaccharide Storage Myopathy (PSM), Malignant Hyperthermia (MH), Grey Horse Melanoma, Recurrent Exertional Rhabdomylosis (RER), Hereditary Equine Regional Dermal Asthenia (HERDA), Lavendar Foal Disease, Cerebellar Abiotrophy (CA), Glycogen Branching Enzyme Deficiency (GBAD), Severe Combined Immunodeficiency (SCID), and Junctional Epidermolysis Bullosa (JEB)