Apple Lytes
An increase in body temperature, either as a result of exercise, travelling or high environmental temperature will cause the horse to sweat. The evaporation of this sweat helps the horse to cool down and regulate his body temperature.
Sweating causes fluid loss, together with the loss of body salts called electrolytes, contained in the sweat.
A horse in moderate work, trotting and cantering, can lose as much as 5-7 litres of fluid, and 50-70g electrolytes in an hour, and this will increase as the work intensity or duration increases, and even more if the weather is hot and humid!