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The hoof is the tip of a toe of an ungulate mammal, which is covered and strengthened with a thick and horny keratin covering. Artiodactyls are even-toed ungulates, species whose feet have an even number of digits; the ruminants with two digits are the most numerous, e.g. giraffe, deer, bison, cattle, goat, pigs, and sheep. The feet of perissodactyl mammals have an odd number of toes, e.g. the horse, the rhinoceros, and the tapir. Although hooves are limb structures primarily found in placental mammals, hadrosaurs such as Edmontosaurus possessed hoofed forelimbs. The marsupial Chaeropus also had hooves.
A farrier is a specialist in equine hoof care, including the trimming and balancing of horses' hooves and the placing of shoes on their hooves, if necessary. A farrier combines some blacksmith's skills with some veterinarian's skills to care for horses' feet. Traditionally an occupation for men, in a number of countries women have now become farriers.
Laminitis is a disease that affects the feet of ungulates and is found mostly in horses and cattle. Clinical signs include foot tenderness progressing to inability to walk, increased digital pulses, and increased temperature in the hooves. Severe cases with outwardly visible clinical signs are known by the colloquial term founder, and progression of the disease will lead to perforation of the coffin bone through the sole of the hoof or being unable to stand up, requiring euthanasia.
Navicular syndrome, often called navicular disease, is a syndrome of lameness problems in horses. It most commonly describes an inflammation or degeneration of the navicular bone and its surrounding tissues, usually on the front feet. It can lead to significant and even disabling lameness.
There are many aspects to horse management. Horses, ponies, mules, donkeys and other domesticated equids require attention from humans for optimal health and long life.
The frog is a part of a horse hoof, located on the underside, which should touch the ground if the horse is standing on soft footing. The frog is triangular in shape, and extends midway from the heels toward the toe, covering around 25% of the bottom of the hoof.
A horse hoof is the lower extremity of each leg of a horse, the part that makes contact with the ground and carries the weight of the animal. It is both hard and flexible. It is a complex structure surrounding the distal phalanx of the 3rd digit of each of the four limbs, which is covered by soft tissue and keratinised (cornified) matter.
The pastern is a part of the leg of a horse between the fetlock and the top of the hoof. It incorporates the long pastern bone and the short pastern bone, which are held together by two sets of paired ligaments to form the pastern joint. Anatomically homologous to the two largest bones found in the human finger, the pastern was famously mis-defined by Samuel Johnson in his dictionary as "the knee of a horse". When a lady asked Johnson how this had happened, he gave the much-quoted reply: "Ignorance, madam, pure ignorance."
Chronic progressive lymphedema (CPL) is a disease of some breeds of draft horse, whereby the lower legs becomes progressively more swollen. There is no cure; the aim of treatment is to manage the signs and slow progression of the disease. The cause of CPL is not known, although it is suspected that a genetic disorder of elastin metabolism prevents the lymphatic vessels from functioning properly, leading to edema of the lower limbs. CPL resembles the human disease elephantiasis verrucosa nostra.
Equine podiatry is the study and management of the equine foot based on its anatomy and function.
Lameness is an abnormal gait or stance of an animal that is the result of dysfunction of the locomotor system. In the horse, it is most commonly caused by pain, but can be due to neurologic or mechanical dysfunction. Lameness is a common veterinary problem in racehorses, sport horses, and pleasure horses. It is one of the most costly health problems for the equine industry, both monetarily for the cost of diagnosis and treatment, and for the cost of time off resulting in loss-of-use.
Limb perfusion is a medical technique that is used to deliver drugs locally directly to a site of interest. It is commonly used in human medicine for administration of anticancer drugs directly to an arm or leg. It is also used in veterinary medicine to deliver drugs to a site of infection or injury, as well as for the treatment of cancer in dogs. In both cases, a tourniquet is used to reduce blood flow out of the area that is being treated.
Guttural pouches are large, auditory-tube diverticula that contain between 300 and 600 ml of air. They are present in odd-toed mammals, some bats, hyraxes, and the American forest mouse. They are paired bilaterally just below the ears, behind the skull and connect to the nasopharynx.
Racehorse injuries and fatalities are a side effect of the training and competition of horse racing. Racehorse injuries are considered especially difficult to treat, as they frequently result in the death of the horse. A 2005 study by the United States Department of Agriculture found that injuries are the second leading cause of death in horses, second only to old age.
The limbs of the horse are structures made of dozens of bones, joints, muscles, tendons, and ligaments that support the weight of the equine body. They include two apparatuses: the suspensory apparatus, which carries much of the weight, prevents overextension of the joint and absorbs shock, and the stay apparatus, which locks major joints in the limbs, allowing horses to remain standing while relaxed or asleep. The limbs play a major part in the movement of the horse, with the legs performing the functions of absorbing impact, bearing weight, and providing thrust. In general, the majority of the weight is borne by the front legs, while the rear legs provide propulsion. The hooves are also important structures, providing support, traction and shock absorption, and containing structures that provide blood flow through the lower leg. As the horse developed as a cursorial animal, with a primary defense mechanism of running over hard ground, its legs evolved to the long, sturdy, light-weight, one-toed form seen today.
The treatment of equine lameness is a complex subject. Lameness in horses has a variety of causes, and treatment must be tailored to the type and degree of injury, as well as the financial capabilities of the owner. Treatment may be applied locally, systemically, or intralesionally, and the strategy for treatment may change as healing progresses. The end goal is to reduce the pain and inflammation associated with injury, to encourage the injured tissue to heal with normal structure and function, and to ultimately return the horse to the highest level of performance possible following recovery.
Shivers, or equine shivering, is a rare, progressive neuromuscular disorder of horses. It is characterized by muscle tremors, difficulty holding up the hind limbs, and an unusual gait when the horse is asked to move backwards. Shivers is poorly understood and no effective treatment is available at this time.
Susan Marie Stover is a professor of veterinary anatomy at the University of California, Davis School of Veterinary Medicine and director of the J.D. Wheat Veterinary Orthopedic Research Laboratory. One of the focuses of her wide-ranging research is musculoskeletal injuries in racehorses, particularly catastrophic breakdowns. Her identification of risk factors has resulted in improved early detection and changes to horse training and surgical repair methods. On July 30, 2016, Stover received the Lifetime Excellence in Research Award from the American Veterinary Medical Association. In August 2016, she was selected for induction into the University of Kentucky Equine Research Hall of Fame.
In hoofed animals, the deciduous hoof capsule is the eponychium in fetuses and newborn foals. It is a deciduous structure, which disappears as the animal grows. In equines, they are shed soon after a foal begins to stand. The shedding process can vary from dropping-off whole to the gradual wearing down of the capsule. Common names used in lay literature include "golden slippers", "fairy fingers", and "horse feathers".
Simon John Curtis is a farrier, author, lecturer and horse hoof-care expert with a PhD in Equine Physiology and Biomechanics (2017). He is a 4th generation farrier; his family have been farriers and blacksmiths in the Newmarket area for at least 150 years. In over 45 years working as a farrier, he has lectured and demonstrated in more than 30 countries including the USA, Australia, India, Russia, and Brazil.
References
- ↑ Smith, M R W (2014). "Investigating penetrating injuries of the equine hoof". Equine Veterinary Education. 26 (11): 580–583. doi:10.1111/eve.12257 . Retrieved 8 May 2024.
- ↑ Milner, Peter; Hughes, Ian (2012). "Remedial farriery Part 3: The role of farriery in the surgical management of quittor in the horse". UK Vet. 17 (January): 4–7. doi:10.1111/j.2044-3862.2011.00130.x . Retrieved 9 May 2024.