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Hyperkalemic periodic paralysis (HYPP), a genetic defect of horses, causes abnormal function of muscle cells, leading to unbalanced sodium and potassium concentrations in muscle tissues. Unstable mineral concentrations, in turn, trigger abnormalities in electrical signals that control muscle contraction.

Limiting potassium intake is one of the most effective steps in managing HYPP horses. This pertains not only to forages and concentrates but also supplements, including electrolytes.

The primary minerals in commercial electrolyte supplements are sodium, chloride, and potassium. This makes sense, as these are the minerals lost in greatest abundance in sweat. But all horses do not require the same electrolyte supplementation. In fact, think twice before offering a horse diagnosed with HYPP a commercial electrolyte.

“HYPP horses should never get prepared electrolytes,” said Kathleen Crandell, Ph.D., a nutritionist with Kentucky Equine Research (KER), Versailles, Ky. “These horses should only be supplemented with regular salt, also known as sodium chloride. Because HYPP horses are usually not elite athletes, excessive sweat loss is typically not an issue.” For these horses, a white salt block is the best bet.

Other tips for feeding horses with HYPP.

Learn more about metabolic syndromes and feeding strategies of horses affected by them. Download “Nutritional Management of Metabolic Diseases” today.

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