An ambling gait or amble is any of several four-beat intermediate horse gaits, all of which are faster than a walk but usually slower than a canter and always slower than a gallop. Horses that amble are sometimes referred to as "gaited", particularly in the United States. Ambling gaits are smoother for a rider than either the two-beat trot or pace and most can be sustained for relatively long periods, making them particularly desirable for trail riding and other tasks where a rider must spend long periods in the saddle. Historically, horses able to amble were highly desired for riding long distances on poor roads. Once roads improved and carriage travel became popular, their use declined in Europe but continued in popularity in the Americas, particularly in areas where plantation agriculture was practiced and the inspection of fields and crops necessitated long daily rides.
The ability to perform an ambling gait is usually an inherited trait. In 2012, a DNA study found that horses from several gaited and harness racing breeds carried a mutation on the gene DMRT3, which controls the spinal neurological circuits related to limb movement and motion. In 2014, that mutation was found to originate in a single ancestor to all gaited horses. Some gaited breeds naturally perform these gaits from birth, others need to be trained to do them. Some breeds have individuals who can both amble and perform a trot or pace. In the Standardbred breed, the DMRT3 gene was also found in trotting horses, suggesting that it inhibits the ability to transition into a canter or gallop.
Though there are differences in footfall patterns and speed of the various gaits, historically they were collectively referred to as an "amble". The many different names for these gaits reflect the nuanced differences sought by aficionados of each particular breed, with traits considered desirable in one breed sometimes discouraged in another. Gaited breeds occur in many parts of the world, but are particularly prevalent in North and South America.
History
Ambling was described as early as the Hittite writings of Kikkuli. The amble was particularly prized in horses in the Middle Ages due to the need for people to travel long distances on poor roads. The Old High German term for a gaited horse was celtari (Modern German Zelter), cognate to Icelandic tölt. English amble is a 14th-century loan from Old French, ultimately from Latin ambulare "to walk". Horse types with ambling ability included the valuable jennet and palfrey. By the 18th century, the amble was a topic of discussion among horse trainers in Europe, and the 1728 Cyclopedia discussed the lateral form of the gait, which is derived from the pace, and some of the training methods used to create it in a horse that did not appear to be naturally gaited.
As roads improved and carriage travel became more common, followed later by railroads, riding horses that trotted became more popular in Europe; the dominant uses of riding horses came to include light cavalry, fox hunting and other types of rapid travel across country, but of more limited duration, where the gallop could be used. The amble was still prized in the Americas, particularly in the southern United States and in Latin America where plantation agriculture required riders to cover long distances every day to view fields and crops.. Today, ambling or gaited horses are popular amongst casual riders who seek soft-gaited, comfortable horses for pleasure riding.
As a general rule, while ambling horses are able to canter, they usually are not known for speed, nor is it particularly easy for them to transition from an ambling gait into the canter or gallop. Thus, in history, where comfort for long hours in the saddle was important, ambling horses were preferred for smoothness, sure-footedness and quiet disposition. However, when speed and quick action was of greater importance, horses that trotted were more suitable due to their speed and agility. When horses were used in warfare, particularly during the Middle Ages, it was not uncommon for a knight to ride an ambling horse to a battle site, then switch to a war horse for galloping into the actual battle.
Types of ambling gaits
All ambling gaits have four beats. Some ambling gaits are lateral gaits, meaning that the feet on the same side of the horse move forward, but one after the other, usually in a footfall pattern of right rear, right front, left rear, left front. Others are diagonal, meaning that the feet on opposite sides of the horse move forward in sequence, usually right rear, left front, left rear, right front. A common trait of the ambling gaits is that usually only one foot is completely off the ground at any one time.Lieberman, Bobbie. "Easy-Gaited Horses." Equus, issue 359, August, 2007, pp. 47–51. Ambling gaits are further distinguished by the timing and cadence of the footfall pattern. One distinction is whether the footfall rhythm is isochronous, four equal beats in a 1-2-3-4 rhythm; or a non-isochronous 1-2, 3-4 rhythm created by a slight pause between the groundstrike of the forefoot of one side to the rear of the other.
Many breeds of horses inherit the ability to perform these gaits, which may be observable naturally from birth or may present with a minimal amount of training. Some horses without apparent inborn gaited ability can be taught to "gait" or amble. However, training usually is not successful unless there is some inherited genetic ability in the horse. Ambling gaits can be taught by slightly restraining the horse at a trot or pace. The length of the stride is kept long, but the rider asks the horse to alter its balance to break up the two strides in such a manner to produce a four-beat gait. Sometimes, this effect is accidentally produced in an attempt to create the slow two-beat jog trot desired in western pleasure competition when the horse cannot sustain a slow jog and falls into a shuffling, four beat gait described as "trotting in front and walking behind," which is penalized in the show ring.
Some horses can both trot and amble, and some horses pace in addition to the amble instead of trotting. However, pacing in gaited horses is often, though not always, discouraged. Some horses neither trot nor pace easily, but prefer their ambling gait for their standard intermediate speed.
Conformation also plays a role. Horses with a longer back at the lumbosacral joint or "coupling" will find it easier to perform a lateral ambling gait, though they may also have to work harder to have proper collection. An average length back still allows a horse to perform ambling gaits, though a very short-coupled horse usually can only perform the trot. A well-laid back shoulder and somewhat horizontal hip angle favor a longer length of stride and is helpful in horses that fox trot, while a steeper shoulder angle combined with more sloping croup produce a stride more desirable in some lateral gaits such as the running walk.
A particular form of ambling gait considered desirable in one breed is often penalized in another. For example, the Missouri Foxtrotter is specifically bred to perform the fox trot, a diagonal ambling gait, while the Paso Fino is bred to perform lateral gaits and sometimes is penalized for a diagonal gait, which in that breed is called trocha.
Heritability and breeding
In most "gaited" breeds, an ambling gait is a hereditary trait. However, some representatives of these breeds may not always gait, and some horses of other breeds not considered "gaited" may have ambling-gaited ability, particularly with training. A 2012 DNA study of movement in Icelandic horses, harness racing horse breeds, and mice determined that a mutation on the gene DMRT3, which controls the spinal neurological circuits related to limb movement and motion, causes a premature stop codon in horses with lateral ambling gaits. This mutation may be a dominant gene, in that even one copy of the mutated allele will produce gaitedness. Horses who are homozygous for the gene may have a stronger gaited ability than those who are heterozygous. Horses can now be tested for the presence or absence of this allele. In 2012, the mutated gene was found in the Icelandic horse, the Tennessee Walking Horse, the Peruvian Paso, and the Kentucky Mountain Saddle Horse. In 2014, a new study of the DMRT3 gene, now dubbed the "gait keeper" gene, examined over 4000 horses worldwide and DNA study found that gaitedness originated in a single ancient domestic ancestor as a spontaneous genetic mutation. In 2016, a study of DMRT3 SNP in paleographic DNA located the ambling horse mutation to medieval England with subsequent spread by Vikings first to Iceland in the 10th century.
Breeds known for galloping ability, including the Thoroughbred and even the wild Przewalski’s horse, do not possess the mutated form of the gene.
A number of horse breeds have observed natural gaited tendencies, including the American Saddlebred, Boerperd, Icelandic horse, Missouri Fox Trotter, Paso Fino, Peruvian Paso, Racking horse, Rocky Mountain Horse, Spotted Saddle horse, and Tennessee Walking Horse. The two-beat lateral pace is also sometimes classified with the ambling gaits as an "alternate" gait, and may be linked to the same genetic mechanism as the lateral ambling gaits. The pacing horses studied were all homozygous for the DMTR3 mutation. But not all horses with the homozygous mutation could pace, suggesting other factors had to come into play for that gait to occur. Although ambling gaits are seen in some Mustangs, and other Colonial Spanish Horses, DMRT3 mutations are rarely seen in feral or wild horses. Researchers theorize that this is due to the difficulty that horses with this mutation have in moving from an ambling gait to a gallop, leading them to be easy prey for predators. Humans, however, have selectively bred for ambling horses, leading to a much more frequent occurrence of DMRT3 mutations among the human-bred horse population.
Of note is that the trotting bloodlines of the Standardbred, though distinct from the pacing bloodlines, also are homozygous for the DMRT3 mutation, suggesting that it not only affects lateral gaits, but inhibits the transition to a gallop. In the studies of Icelandic horses, those animals homozygous for the DMRT3 mutation scored poorly for their ability to both trot and gallop. Researchers concluded that breeders selected away from the mutation in horses bred for sports such as dressage, show jumping, and racing at a gallop.
Lateral ambling gaits
Lateral gaits fall in the sequence right hind, right front, left hind, left front. They can be distinguished by whether the footfall rhythm is "even" or isochronous, four equal beats in a 1-2-3-4 rhythm; or non-isochronous, a slightly uneven 1–2, 3-4 rhythm created because the horse picks up and sets down its feet on each individual side slightly faster, creating a slight pause when switching to the opposite lateral pair of footfalls.
Running walk
The running walk is most often performed by Tennessee Walking Horses. It is a four-beat gait with the same footfall pattern as a regular, or flat, walk, but significantly faster. While a horse performing a flat walk moves at , the running walk allows the same horse to travel at . In the running walk, the horse's rear feet overstep the prints of its front feet by , with a longer overstep being more prized in the Tennessee Walking Horse breed. While performing the running walk, the horse nods its head in rhythm with its gait. Some Tennessee Walking Horses perform other variations of lateral ambling gaits, including the rack, stepping pace, fox trot and single-foot, which are allowable for pleasure riding but penalized in the show ring.
"Slow gaits"