Horses

The horse (Equus caballus, sometimes seen as a subspecies of the Wild Horse, Equus ferus caballus) is a large odd-toed ungulate mammal, one of ten modern species of the genus Equus. more...

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Horses have long been among the most economically important domesticated animals; although their importance has declined with mechanization, they are still found worldwide, fitting into human lives in various ways. The horse is prominent in religion, mythology, and art; it has played an important role in transportation, agriculture, and war; it has additionally served as a source of food, fuel, and clothing.

Horses first evolved in the Americas, but went extinct there until reintroduced by Europeans. While isolated domestication may have occurred as early as 10,000 years ago, the first clear evidence dates to c. 5000 BC, and becomes widespread only after 2000 BC. Selective breeding since that time has produced numerous breeds. Some can be ridden, usually with a saddle, while other breeds can be harnessed to pull objects such as carriages or plows. In some societies, horses are a source of food, both meat and milk; in others it is taboo to consume them. In industrialized countries horses are predominantly kept for leisure and sporting pursuits, while they are still used as working animals in many other parts of the world.

Biology of the horse

See also: Horse breeding

Age

Depending on breed, management, and environment, the domestic horse today has an average life expectancy of 25 to 30 years. Some specific breeds of horse can live into their 40s, and, occasionally, beyond. The oldest verifiable record was "Old Billy," a horse that lived in the 19th century, believed to have lived to the age of 62.

Reproduction and development

Pregnancy lasts for approximately 11 months and usually results in one foal (male: colt, female: filly). Twins are rare. Females 4 years and over are called mares and males are stallions. A castrated male is a gelding. Horses, particularly colts, may sometimes be physically capable of reproduction at approximately 18 months but in practice are rarely allowed to breed until a minimum age of 3 years, especially females. Horses four years old are considered mature, though the skeleton usually finishes developing at the age of six, and the precise time of completion of development also depends on the horse's size (therefore a connection to breed exists), gender, and the quality of care provided by its owner. As with humans, females develop faster than males. Also, if the horse is larger, its bones are larger; therefore, not only do the bones take longer to actually form bone tissue (bones are made of cartilage in earlier stages of bone formation), but the epiphyseal plates (plates that fuse a bone into one piece by connecting the bone shaft to the bone ends) are also larger and take longer to convert from cartilage to bone as well. These plates convert after the other parts of the bones do but are crucial to development.

Read more at Wikipedia.org