One horse or one pony has to be fed between 1.5% to 2.5% of its body weight each day. The amount of food depends on its age or the level of work it has to execute. The recommended food is grass or hay, and concentrates like grains and commercially prepared pelleted feeds. The weight of one horse can vary as much as one of a human. It might be disposed to obesity or have a slim built. By average, one horse weights around 450 kg, but its weight can be calculated using a weight tape, that can be bought from your local feed store or tack shop. It has to have fresh water at all times, in abundance, between 37 to 45 litres a day, unless its medical condition or other reasons demand you to limit the water for a period of time. It is better to serve food to your horse in small and more often meals, unless you keep it on pasture.
A free horse, which is not ridden daily or does not provide any hard working or any other stressors, could be held on hay alone. It also has to have access to a block of salt or loose salt. Keep in mind that horses or ponies that work need a ratio or forage and concentrates in order to keep fit, healthy and ready for work. If its meals are not given properly, the horse might be subject to colic or laminitis, two diseases caused by spoiled feeding or abrupt changes in its feeding program. The ones that are underfed, might develop growth disorders, due to an imbalance in the nutrients. Osteochondrosis is a disease in horses overfed. The best is to monitor the health of your horse or horses on a regular basis, by analyzing and monitoring its body conditions.