Sodium deficiency leads to dehydration in horses! The electrolyte most likely to be in short supply in horses is sodium. You are better off providing extra sodium rather than too little, as a healthy horse can easily excrete the excess if plenty of fresh water is available.
Table salt is 40% sodium by weight (plain old iodized salt from the grocery store) – 2 tablespoons mixed with wet feed or sprinkled over wet hay fulfills the baseline daily sodium requirement (before sweat losses) for a 1000 lb horse. Read the rest of this entry »