Laminitis is a serious hoof disease found in equines (e.g. horses, ponies, donkeys). Although it is very rare for laminitis to kill a horse directly, severe cases can result in the horse being put down for humane reasons (horse is in pain) or economic factors (horse is crippled and can no longer be used). Such euthanasia is sufficiently common that laminitis has become the second most common cause of premature horse death.

The term 'laminitis' comes from 'laminae', which is the tissue which connects the hoof bone (correctly known as the pedal bone) to the hoof wall. Damage to this tissue is known as 'laminitis'. In mild cases the tissue becomes inflamed and begins to break down, reducing the strength of the bone-wall connection. In more severe cases the connection is reduced to the point that the bone begins to move, rotating within the hoof and sinking down. In extreme cases, the hoof will actually go through the sole of the hoof. As the bone moves, it can cause further damage to blood vessels and other surrounding tissues. Longer term, this damage affects the hoof repair and growth mechanisms, resulting in various types and degree of abnormal growth (e.g. convex or flat sole, hoof wall rings, separation of sole and hoof wall). In mild cases, the horse can return to normal activities. In more severe cases, the horse will need to be retired or put down.

The term 'founder' is associated with laminitis but can be used in several different senses. Some people use founder as the lay term for laminitis, while others use it to describe the more serious forms of laminitis (e.g. when the pedal bone penetrates the sole).

There are two main sources of damage to the laminae, leading to laminitis. One is toxins, which enter the blood and travel to the laminae, where they cause inflammation and tissue breakdown. The other is mechanical, where the laminae is damaged due to repeated shocks to the hoof (e.g. from running or jumping on hard surfaces).

Overly rich food changes the bacterial population in the intestines, with a subsequent release of toxins by the bacteria. It occurs when the horse received a large amount of food which is too high in carbohydrates or nitrogen. This can occur either with rich feed (e.g. grain or muesli) or lush pasture. Pasture is most likely to be too rich in spring, when rain follows a dry period, or when fertilizer has been used. As some breeds (especially ponies) are more sensitive, special care should be taken that neither their feed nor their pasture is too rich. When putting horses and ponies on rich pasture, one should limit the amount of grazing time and consider the use of a grazing muzzle to restrict the amount they eat.

Mechanically caused laminitis most often occurs in competition horses, such as jumping horses or race horses, which are worked on hard ground. However, it can also occur to pleasure horses, if they are worked or travel on hard surfaces. One should try to avoid use of a horse on hard surfaces and when it is necessary to travel on hard surfaces try to reduce the pace as a walking horse will have less shock to its feet than a running horse. Ensure that the feet are correctly trimmed; in particular avoid over-trimming or trimming for long toes as these reduce the shock resistance of the feet. If the horse has shoes, ensure that the shoeing is done by a competent professional. Shock absorbing shoes (e.g. horse shoes with a rubber component) and boots are increasingly used, even in competitive sports, to reduce not only the risk of laminitis but also other shock related injuries.

The third major cause of laminitis is toxins which are unrelated to overly rich feed. This includes toxins which are ingested (e.g. through moldy hay, or grass which has been treated with herbicides) or toxins which are produced due to an infection within the horse. Ensure that food does not contain fungus, mold or chemicals. Ensure that any infections are promptly and aggressively treated, before they can result in toxin overload leading to laminitis.

The above article on Laminitis and Founder was written by Dr. Doug Stewart.

categories: laminitis,founder,horse,horses,equine,horse disease,horse illnesses,horse illnesses,pets

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Written by Doug Stewart using tags: equine, founder, horse, horse disease, horse illnesses, horses, laminitis, Pets