Did you know a horse not in work loses up to 10 litres a day in sweat! That means losses of 10 grams of Sodium, 10 grams of Chloride, 25 grams of Potassium and 10 grams of Magnesium!
Tying up is a common problems in performance horses. Research in England suggests tying up is related to electrolyte imbalances.
So how do you replace these significant electrolyte losses? A portion of sodium and chloride can be obtained by providing a salt lick block. Potassium can be picked up in forage, typically hay provides 10-20 grams per kg. German research revealed horses fed adequate forage maintained better water and potassium balances during exercise than horses fed a high concentrate diet (Grain).
Magnesium however is not readily available in sufficient quantities to replenish a horses needs. Magnesium must be fed in conjunction with Calcium (close to 3:1 Calcium: Magnesium) in conjunction with Boron to be adequately supplied to and utilised by the small intestine.