Electrolytes are charged particles, which when dissolved in water or body fluids produce positive (cations) and negative (anions) ions. These ions have a crucial role in maintaining normal health and functioning of the body in a horse.
They ensure smooth working of enzymatic pathways, nervous, cardiac, musculo-skeletal and even digestive system, apart from also helping maintain osmotic pressure and fluid balance. As a result, a balanced homeostasis (body’s ability to maintain a stable internal environment) is achieved.
The 5 major ions required by a growing and an adult horse include sodium (Na+), potassium (K+), chloride (Cl–), calcium (Ca2+) and magnesium (Mg2+).
Functions of the major ions:
Sodium (Na+) Most abundant extracellular ion, maintains blood pressure and nerve impulse, replenishes negative sodium levels due to sweating while exercising, working and in conditions like diarrhoea.
Potassium (K+) Present as intracellular ion, maintains nerve impulses, cardiac health and in conjunction with Na+ ensures osmotic and acid-base balance.
Chloride (Cl–) Most significant extracellular anion, helps maintain isotonicity and co-exists with sodium to maintain fluid balance.
Calcium (Ca2+) Present as extracellular ion, regulates membrane potential (neuromuscular) which is crucial for muscle contraction and relaxation including the cardiac muscles.
Magnesium (Mg2+) Second most abundant intracellular cation, works as co-factor of various enzymatic activities in numerous metabolic pathways, phosphate transfers, muscle contractility and neuronal transmission.