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Arabian horse

Horse breed originating in West Asia

  • 46 min read
  • 10 chapters
Arabian mare standing in a show halter pose
Ealdgyth · CC BY-SA 3.0

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Through Desert and Selective breeding

The Arabian developed in a desert climate and was prized by the nomadic Bedouin people, often being brought inside the family tent for shelter and protection from theft. Selective breeding for traits, including an ability to form a cooperative relationship with humans, created a horse breed that is good-natured, quick to learn, and willing to please. The Arabian also developed the high spirit and alertness needed in a horse used for raiding and war. This combination of willingness and sensitivity requires modern Arabian horse owners to handle their horses with competence and respect.

The Arabian is a versatile breed. Arabians dominate the discipline of endurance riding and compete today in many other fields of equestrian sport. They are one of the top ten most popular horse breeds in the world. They are now found worldwide, including the United States and Canada, the United Kingdom, Australia, continental Europe, South America (especially Brazil), and their land of origin, the Middle East.

Breed characteristics

Arabian horses have refined, wedge-shaped heads, a broad forehead, large eyes, large nostrils, and small muzzles. Most display a distinctive concave, or "dished" profile. Many Arabians also have a slight forehead bulge between their eyes, called the jibbah by the Bedouin, that adds additional sinus capacity, believed to have helped the Arabian horse in its native dry desert climate. Another breed characteristic is an arched neck with a large, well-set windpipe set on a refined, clean throatlatch. This structure of the poll and throatlatch was called the mitbah or mitbeh by the Bedouin. In the ideal Arabian, it is long, allowing flexibility in the bridle and room for the windpipe.

Other distinctive features are a relatively long, level croup, or top of the hindquarters, and naturally high tail carriage. The USEF breed standard requires Arabians to have solid bone and standard correct equine conformation. Well-bred Arabians have a deep, well-angled hip and well laid-back shoulder. Within the breed, there are variations. Some individuals have wider, more powerfully muscled hindquarters suitable for intense bursts of activity in events such as reining, while others have longer, leaner muscling better suited for long stretches of flatwork such as endurance riding or horse racing. Most have a compact body with a short back. Arabians usually have dense, strong bone, and good hoof walls. They are especially noted for their endurance, and the superiority of the breed in endurance riding competition demonstrates that well-bred Arabians are strong, sound horses with superior stamina. The Arabian Horse Society of Australia maintains that, at international FEI-sponsored endurance events, Arabians and half-Arabians are the dominant performers in distance competition.

Skeletal analysis

Some Arabians, though not all, have 5 lumbar vertebrae instead of the usual 6, and 17 pairs of ribs rather than 18. A quality Arabian has both a relatively horizontal croup and a properly angled pelvis as well as good croup length and depth to the hip (determined by the length of the pelvis), that allows agility and impulsion. A misconception confuses the topline of the croup with the angle of the "hip" (the pelvis or ilium), leading some to assert that Arabians have a flat pelvis angle and cannot use their hindquarters properly. However, the croup is formed by the sacral vertebrae. The hip angle is determined by the attachment of the ilium to the spine, the structure and length of the femur, and other aspects of hindquarter anatomy, which is not correlated to the topline of the sacrum. Thus, the Arabian has conformation typical of other horse breeds built for speed and distance, such as the Thoroughbred, where the angle of the ilium is more oblique than that of the croup. Thus, the hip angle is not necessarily correlated to the topline of the croup. Horses bred to gallop need a good length of croup and good length of hip for proper attachment of muscles, and so unlike angle, length of hip and croup do go together as a rule.

Size

The breed standard stated by the United States Equestrian Federation, describes Arabians as standing between 14.1 to 15.1 hands (57 to 61 inches, 145 to 155 cm) tall, "with the occasional individual over or under". Thus, all Arabians, regardless of height, are classified as "horses", even though 14.2 hands (58 inches, 147 cm) is the traditional cutoff height between a horse and a pony. A common myth is that Arabians are not strong because they are relatively small and refined. However, the Arabian horse is noted for a greater density of bone than other breeds, short cannons, sound feet, and a broad, short back, all of which give the breed physical strength comparable to many taller animals. Thus, even a smaller Arabian can carry a heavy rider. For tasks where the sheer weight of the horse matters, such as farm work done by a draft horse, any lighter-weight horse is at a disadvantage. However, for most purposes, the Arabian is a strong and hardy light horse breed able to carry any type of rider in most equestrian pursuits.

Temperament

For centuries, Arabian horses lived in the desert in close association with humans. For shelter and protection from theft, prized war mares were sometimes kept in their owner's tent, close to children and everyday family life. Only horses with a naturally good disposition were allowed to reproduce, with the result that Arabians today have a good temperament that, among other examples, makes them one of the few breeds where the United States Equestrian Federation rules allow children to exhibit stallions in nearly all show ring classes, including those limited to riders under 18.

On the other hand, the Arabian is also classified as a "hot-blooded" breed, a category that includes other refined, spirited horses bred for speed, such as the Akhal-Teke, the Barb, and the Thoroughbred. Like other hot-bloods, Arabians' sensitivity and intelligence enable quick learning and greater communication with their riders; however, their intelligence also allows them to learn bad habits as quickly as good ones, and they do not tolerate inept or abusive training practices. Some sources claim that it is more difficult to train a "hot-blooded" horse. Though most Arabians have a natural tendency to cooperate with humans, when treated badly, like any horse, they can become excessively nervous or anxious, but seldom become vicious unless seriously spoiled or subjected to extreme abuse. At the other end of the spectrum, romantic myths are sometimes told about Arabian horses that give them near-divine characteristics.

Colors

The Arabian Horse Association registers purebred horses with the coat colors bay, gray, chestnut, black, and roan. Bay, gray and chestnut are the most common; black is less common. The classic roan gene does not appear to exist in Arabians; rather, Arabians registered by breeders as "roan" are usually expressing rabicano or, sometimes, sabino patterns with roan features. All Arabians, no matter their coat color, have black skin, except under white markings. Black skin provided protection from the intense desert sun.

Gray and white

Although many Arabians appear to have a "white" hair coat, they are not genetically "white". This color is usually created by the natural action of the gray gene, and virtually all white-looking Arabians are actually grays. A specialized colorization seen in some older gray Arabians is the so-called "bloody-shoulder", which is a particular type of "flea-bitten" gray with localized aggregations of pigment on the shoulder.

There are a very few Arabians registered as "white" defined as having a white coat, pink skin and dark eyes from birth. These animals are believed to manifest a form of dominant white, W3, a result of a nonsense mutation in DNA tracing to a single stallion foaled in 1996. It is possible that white mutations have occurred in Arabians in the past and it is likely that mutations other than W3 exist but have not been verified by genetic testing.

Sabino

One spotting pattern, sabino, does exist in purebred Arabians. Sabino coloring is characterized by white markings such as "high white" above the knees and hocks, irregular spotting on the legs, belly and face, white markings that extend beyond the eyes or under the chin and jaw, and sometimes lacy or roaned edges.

The genetic mechanism that produces sabino patterning in Arabians is now thought to be a form of dominant white, and more than one gene may be involved. However, studies at the University of California, Davis indicate that Arabians do not appear to carry the autosomal dominant gene "SB1" or sabino 1, that often produces bold spotting and some completely white horses in other breeds. The inheritance patterns observed in sabino-like Arabians also do not follow the same mode of inheritance as sabino 1.

Rabicano or roan

There are very few Arabians registered as roan, and according to researcher D. Phillip Sponenberg, roaning in purebred Arabians is actually the action of rabicano genetics. Unlike a genetic roan, rabicano is a partial roan-like pattern; the horse does not have intermingled white and solid hairs over the entire body, only on the midsection and flanks, the head and legs are solid-colored. Some people also confuse a young gray horse with a roan because of the intermixed hair colors common to both. However, a roan does not consistently lighten with age, while a gray does.

Colors that do not exist in purebreds

There is pictorial evidence from pottery and tombs in Ancient Egypt suggesting that spotting patterns may have existed on ancestral Arabian-type horses in antiquity. Nonetheless, purebred Arabians today do not carry genes for pinto or Leopard complex ("Appaloosa") spotting patterns, except for certain dominant white spotting patterns, sometimes described as sabino.

Spotting or excess white was believed by many breeders to be a mark of impurity until DNA testing for verification of parentage became standard. For a time, horses with belly spots and other white markings deemed excessive were discouraged from registration and excess white was sometimes penalized in the show ring.

Purebred Arabians never carry dilution genes. Therefore, purebreds cannot be colors such as dun, cremello, palomino or buckskin.

To produce horses with some Arabian characteristics but coat colors not found in purebreds, they have to be crossbred with other breeds. Though the purebred Arabian produces a limited range of potential colors, they do not appear to carry any color-based lethal disorders such as the frame overo gene ("O") that can produce lethal white syndrome (LWS). Because purebred Arabians cannot produce LWS foals, Arabian mares were used as a non-affected population in some of the studies seeking the gene that caused the condition in other breeds. Nonetheless, partbred Arabian offspring can, in some cases, carry these genes if the non-Arabian parent was a carrier.

Genetic disorders

There are six known genetic disorders in Arabian horses. Two are inevitably fatal, two are not inherently fatal but are disabling and usually result in euthanasia of the affected animal; the remaining conditions can usually be treated. Three are thought to be autosomal recessive conditions, which means that the flawed gene is not sex-linked and has to come from both parents for an affected foal to be born. One may be an autosomal dominant. Arabians are not the only breed of horse to have problems with inherited diseases; partbred Arabians may inherit deleterious genetics from other breeds.

Genetic diseases that can occur in purebred Arabians, or in partbreds with Arabian ancestry in both parents, are the following:

  • Severe Combined Immunodeficiency (SCID). Recessive disorder, fatal when homozygous, carriers (heterozygotes) show no signs. Similar to the "bubble boy" condition in humans, an affected foal is born with a complete lack of an immune system, and thus generally dies of an opportunistic infection, usually before the age of three months. There is a DNA test that can detect healthy horses who are carriers of the gene causing SCID, thus testing and careful, planned matings can now eliminate the possibility of an affected foal ever being born.
  • Lavender Foal Syndrome (LFS), also called Coat Color Dilution Lethal (CCDL). Recessive disorder, fatal when homozygous, carriers show no signs. The condition has its name because most affected foals are born with a coat color dilution that lightens the tips of the coat hairs, or even the entire hair shaft. Foals with LFS are unable to stand at birth, often have seizures, and are usually euthanized within a few days of birth. In November 2009, Cornell University announced that a DNA test has been developed to detect carriers of LFS. Simultaneously, the University of Pretoria also announced that they had also developed a DNA test.
  • Cerebellar abiotrophy (CA or CCA). Recessive disorder, homozygous horses are affected, carriers show no signs. An affected foal is usually born without clinical signs, but at some stage, usually after six weeks of age, develops severe incoordination, a head tremor, wide-legged stance and other symptoms related to the death of the purkinje cells in the cerebellum. Such foals are frequently diagnosed only after they have crashed into a fence or fallen over backwards, and often are misdiagnosed as suffering from a head injury caused by an accident. Severity varies, with some foals having fast onset of severe coordination problems, others showing milder signs. Mildly affected horses can live a full lifespan, but most are euthanized before adulthood because they are so accident-prone as to be dangerous. As of 2008, there is a genetic test that uses DNA markers associated with CA to detect both carriers and affected animals. Clinical signs are distinguishable from other neurological conditions, and a diagnosis of CA can be verified by examining the brain after euthanasia.
  • Occipital Atlanto-Axial Malformation (OAAM). This is a condition where the occiput, atlas and axis vertebrae in the neck and at the base of the skull are fused or malformed. Symptoms range from mild incoordination to the paralysis of both front and rear legs. Some affected foals cannot stand to nurse, in others the symptoms may not be seen for several weeks. This is the only cervical spinal cord disease seen in horses less than 1 month of age, and a radiograph can diagnose the condition. There is now a genetic test for OAAM.
  • Equine juvenile epilepsy, or Juvenile Idiopathic Epilepsy, sometimes referred to as "benign" epilepsy, is not usually fatal. Foals appear normal between epileptic seizures, and seizures usually stop occurring between 12 and 18 months. Affected foals may show signs of epilepsy anywhere from two days to six months from birth. Seizures can be treated with traditional anti-seizure medications, which may reduce their severity. Though the condition has been studied since 1985 at the University of California, Davis, the genetic mode of inheritance is unclear, though the cases studied were all of one general bloodline group. Recent research updates suggest that a dominant mode of inheritance is involved in transmission of this trait. One researcher hypothesized that epilepsy may be linked in some fashion to Lavender Foal Syndrome due to the fact that it occurs in similar bloodlines and some horses have produced foals with both conditions.
  • Guttural Pouch Tympany (GPT) occurs in horses ranging from birth to 1 year of age and is more common in fillies than in colts. It is thought to be genetic in Arabians, possibly polygenic in inheritance, but more study is needed. Foals are born with a defect that causes the pharyngeal opening of the eustachian tube to act like a one-way valve – air can get in, but it cannot get out. The affected guttural pouch is distended with air and forms a characteristic nonpainful swelling. Breathing is noisy in severely affected animals. Diagnosis is based on clinical signs and radiographic examination of the skull. Medical management with NSAID and antimicrobial therapy can treat upper respiratory tract inflammation. Surgical intervention is needed to correct the malformation of the guttural pouch opening, to provide a route for air in the abnormal guttural pouch to pass to the normal side and be expelled into the pharynx. Foals that are successfully treated may grow up to have fully useful lives.

The Arabian Horse Association in the United States has created a foundation that supports research efforts to uncover the roots of genetic diseases. The organization F.O.A.L. (Fight Off Arabian Lethals) is a clearinghouse for information on these conditions. Additional information is available from the World Arabian Horse Association (WAHO).

Recent trends in breeding for halter showing have given rise to Arabian horses with extremely concave facial features, raising concerns that the trait is detrimental to the animal's welfare. Comparisons have been made to a similar trend with some dog breeds, where show judging awarding certain features has led to breeders seeking an ever more exaggerated form, with little concern as to the inherent function of the animal. Some veterinarians speculate that an extremely concave face is detrimental to a horse's breathing, but the issue has not been formally studied.

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