Portal:Horses

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Horse and foal

The horse (Equus ferus caballus) is a domesticated, one-toed, hoofed mammal. It belongs to the taxonomic family Equidae and is one of two extant subspecies of Equus ferus. The horse has evolved over the past 45 to 55 million years from a small multi-toed creature, close to Eohippus, into the large, single-toed animal of today. Humans began domesticating horses around 4000 BCE, and their domestication is believed to have been widespread by 3000 BCE. Horses in the subspecies caballus are domesticated, although some domesticated populations live in the wild as feral horses. These feral populations are not true wild horses, which are horses that never have been domesticated and historically linked to the megafauna category of species. There is an extensive, specialized vocabulary used to describe equine-related concepts, covering everything from anatomy to life stages, size, colors, markings, breeds, locomotion, and behavior.

Horses are adapted to run, allowing them to quickly escape predators, and possess an excellent sense of balance and a strong fight-or-flight response. Related to this need to flee from predators in the wild is an unusual trait: horses are able to sleep both standing up and lying down, with younger horses tending to sleep significantly more than adults. Female horses, called mares, carry their young for approximately 11 months and a young horse, called a foal, can stand and run shortly following birth. Most domesticated horses begin training under a saddle or in a harness between the ages of two and four. They reach full adult development by age five, and have an average lifespan of between 25 and 30 years.

Horse breeds are loosely divided into three categories based on general temperament: spirited "hot bloods" with speed and endurance; "cold bloods", such as draft horses and some ponies, suitable for slow, heavy work; and "warmbloods", developed from crosses between hot bloods and cold bloods, often focusing on creating breeds for specific riding purposes, particularly in Europe. There are more than 300 breeds of horse in the world today, developed for many different uses. (Full article...)

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Skeletal anatomy of a horse

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.

Good conformation in the limbs leads to improved movement and decreased likelihood of injuries. Large differences in bone structure and size can be found in horses used for different activities, but correct conformation remains relatively similar across the spectrum. Structural defects, as well as other problems such as injuries and infections, can cause lameness, or movement at an abnormal gait. Injuries to and problems with horse legs can be relatively minor, such as stocking up, which causes swelling without lameness, or quite serious. Even leg injuries that are not immediately fatal may still be life-threatening to horses, as their bodies are adapted to bear weight on all four legs and serious problems can result if this is not possible. (Full article...)

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Credit: Jeff Kubina

A Thoroughbred race horse at Churchill Downs. The Thoroughbred is a horse breed best known for its use in horse racing. Thoroughbreds are considered a "hot-blooded" horse, known for their agility, speed and spirit, and they have been influential in the creation of many important breeds.

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Jutlands at pasture
The Jutland horse (Danish: Den jyske hest) is a draft horse breed originating in Denmark, named after the Jutland Peninsula which forms the western part of the country. Usually chestnut, they are a compact, muscular breed known for their calm and willing temperament. The breed was originally developed for use in agriculture, but today is more often seen in urban settings and at horse shows. Some of the best known members of the breed pull beer wagons for the Carlsberg brewery around Copenhagen, as well as at competitions and for demonstrations. Images from the 9th century show a horse similar to the Jutland being used by Viking raiders in what is now Great Britain. The first written record is from the 12th century, when they were popular as war horses. Some infusion of bloodlines from other breeds occurred in the 18th century, but the modern Jutland type only began about 1850 with the addition of blood from several other breeds, mainly draft horses. A stud book was created in the late 19th century, and the Jutland population grew to a maximum around 15,000 by 1950. Numbers subsequently declined, and as of 2011, only an estimated 1,000 horses remained. (Full article...)

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