Goat
The goat or domestic goat is a species of goat-antelope that is mostly kept as livestock. It was domesticated from the wild goat of Southwest Asia and Eastern Europe. The goat is a member of the family Bovidae, meaning it is closely related to the sheep. It was one of the first animals to be domesticated, in Iran around 10,000 years ago.
Goats have been used for milk, meat, wool, and skins across much of the world. Milk from goats is often turned into cheese. In 2022, there were more than 1.1 billion goats living in the world, of which 150 million were in India.
Goats feature in mythology, folklore, and religion in many parts of the world, including in the classical myth of Amalthea, in the goats that pulled the chariot of the Norse god Thor, in the Scandinavian Yule goat, in Hinduism's goat-headed Daksha, in the Israelite ritual of the scapegoat, and in Christianity as a common depiction of Satan, among others.
Etymology
The Modern English word goat comes from Old English gāt "goat, she-goat", which in turn derives from Proto-Germanic *gaitaz, ultimately from Proto-Indo-European *ǵʰaidos meaning "young goat". To refer to the male goat, Old English used bucca until ousted by hegote, hegoote in the late 12th century. Nanny goat originated in the 18th century, and billy goat in the 19th century. Female goats, like other various animals, are also called does.Castrated males are called wethers. While the words hircine and caprine both refer to anything having a goat-like quality, hircine is used most often to emphasize the distinct smell of domestic goats.
Juvenile goats are called kids, a term derived from Old Norse kið, with the same meaning. It has been a slang term for human children since the 1590s, and established as an informal term since the 1840s.
History
Goats are among the earliest animals to have been domesticated by humans. A genetic analysis confirms the archaeological evidence that the wild bezoar ibex, found today in the Zagros Mountains, but formerly widespread in Anatolia, is the likely original ancestor of all or most domestic goats today.Neolithic farmers began to herd wild goats primarily for easy access to milk and meat, as well as to their dung, which was used as fuel; and their bones, hair, and sinew were used for clothing, building, and tools. The earliest remnants of domesticated goats dating 10,000 years Before Present are found in Ganj Dareh in Iran. Goat remains have been found at archaeological sites in Jericho, Choga Mami, Djeitun, and Çayönü, dating the domestication of goats in Western Asia at between 8,000 and 9,000 years ago. DNA evidence suggests that goats were domesticated around 10,000 years ago. Historically, goat hide has been used for water and wine bottles in both traveling and transporting wine for sale, and to produce parchment.
Biology
Description
Each breed of goat has specific weight ranges, which vary from more than for bucks of larger breeds such as the Boer, to for smaller does. Within each breed, different strains or bloodlines may have different recognized sizes. At the bottom of the size range are miniature breeds such as the African Pygmy, which stand at the shoulder as adults.Most goats naturally have two horns, their shape and size depending on the breed. There have been incidents of polycerate goats, although this is a genetic rarity. Unlike cattle, goats have not been successfully bred to be reliably polled, as the genes determining sex and those determining horns are closely linked. Breeding together two genetically polled goats results in a high number of intersex individuals among the offspring, which are typically sterile. Their horns are made of living bone surrounded by keratin and other proteins, and are used for defense, dominance, territoriality, and thermoregulation. Both male and female goats may have beards, and many types of goat may have wattles, one dangling from each side of the neck. Goats have horizontal, slit-shaped pupils, allowing them to see well by both night and day, and giving them a wide field of vision on either side to detect predators, while avoiding being dazzled by sunlight from above. Goats have no tear ducts.
Goats are ruminants. They have a four-chambered stomach consisting of the rumen, the reticulum, the omasum, and the abomasum. As with other mammal ruminants, they are even-toed ungulates. The females have an udder consisting of two teats, in contrast to cattle, which have four teats. An exception to this is the Boer goat, which sometimes may have up to eight teats. Goats are diploid with two sets of 30 chromosomes.
Comparison with sheep
and goats are closely related: both are in the subfamily Caprinae. However, they are separate species, so hybrids rarely occur and are always infertile. A hybrid of a ewe and a buck is called a sheep-goat hybrid. Visual differences between sheep and goats include the beard of goats and the divided upper lip of sheep. Sheep tails hang down, even when short or docked, while the short tails of goats are held upwards. Sheep breeds are often naturally polled, while naturally polled goats are rare. Males of the two species differ in that buck goats acquire a unique and strong odor during the rut, whereas rams do not.Behavior and ecology
Goats are naturally curious. They are agile and able to climb and balance in precarious places. This makes them the only ruminant to regularly climb trees. These behaviours have made them notorious for escaping their pens by testing fences and enclosures. If any of the fencing can be overcome, goats almost inevitably escape. Goats are as intelligent as dogs by some studies.When handled as a group, goats display less herding behavior than sheep. When grazing undisturbed, they spread across the field or range, rather than feed side by side as do sheep. When nursing young, goats leave their kids separated rather than clumped, as do sheep. They generally turn and face an intruder, and bucks are more likely to charge or butt at humans than are rams. A 2016 study reports that goats try to communicate with people like domesticated animals such as dogs and horses. They look to a human for assistance when faced with a newly modified challenge.
Reproduction
Goats reach puberty between three and 15 months of age, depending on breed and nutritional status. Many breeders prefer to postpone breeding until the doe has reached 70% of the adult weight, but this separation is rarely possible in extensively managed, open-range herds.Bucks of Swiss and northern breeds come into rut in the fall as with the does' heat cycles. Bucks of equatorial breeds may show seasonal reduced fertility, but as with the does, are capable of breeding at all times. Rut is characterized by a decrease in appetite and obsessive interest in the does. A buck in rut displays flehmen lip curling and urinates on his forelegs and face. Sebaceous scent glands at the base of the horns add to the male goat's odor, which is important to make him attractive to the female. Some does will not mate with a buck which has had its scent glands removed.
Gestation length is approximately 150 days. Twins are the usual result, with single and triplet births also common. Less frequent are litters of quadruplet, quintuplet, and even sextuplet kids. Birthing, known as kidding, generally occurs uneventfully. Just before kidding, the doe will have a sunken area around the tail and hip, as well as heavy breathing. She may have a worried look, become restless and display great affection for her keeper. The mother often eats the placenta, which gives her much-needed nutrients, helps stanch her bleeding, and parallels the behavior of wild herbivores, such as deer, to reduce the lure of the birth scent for predators.
Freshening usually occurs at kidding, although milk production is also relatively common in unbred doelings of dairy breeds. Milk production varies with the breed, age, quality, and diet of the doe; dairy goats generally produce between of milk per 305-day lactation. On average, a good quality dairy doe will give at least of milk per day while she is in milk. A first-time milker may produce less, or as much as, or more of milk in exceptional cases. After the lactation, the doe will "dry off", typically after she has been bred. Occasionally, goats that have not been bred and are continuously milked will continue lactation beyond the typical 305 days. Male lactation sometimes occurs in goats.
Diet
Goats are reputed to be willing to eat almost anything. They are browsing animals, not grazers like cattle and sheep, and will chew on and taste anything resembling plant matter to decide whether it is good to eat, including cardboard, clothing and paper.The digestive physiology of a very young kid is essentially the same as that of a monogastric animal. Milk digestion begins in the abomasum, the milk having bypassed the rumen via closure of the reticuloesophageal groove during suckling. At birth, the rumen is undeveloped, but as the kid begins to consume solid feed, the rumen soon increases in size and in its capacity to absorb nutrients.
The adult size of a particular goat is a product of its breed and its diet while growing. As with all livestock, increased protein diets and sufficient calories during the prepuberty period yield higher growth rates and larger eventual size than lower protein rates and limited calories. Large-framed goats, with a greater skeletal size, reach mature weight at a later age than small-framed goats if both are fed to their full potential. Large-framed goats need more calories than small-framed goats for maintenance of daily functions.
Diseases and life expectancy
While goats are hardy animals and often need little medical care, they are subject to a number of diseases. Among the conditions affecting goats are respiratory diseases including pneumonia, foot rot, internal parasites, pregnancy toxicosis, and feed toxicity. Goats can become infected with various viral and bacterial diseases, such as foot-and-mouth disease, caprine arthritis encephalitis, caseous lymphadenitis, pinkeye, mastitis, and pseudorabies. They can transmit a number of zoonotic diseases to people, such as tuberculosis, brucellosis, Q fever, and rabies.Life expectancy for goats is between 15 and 18 years. An instance of a goat reaching the age of 24 has been reported. Several factors can reduce this average expectancy; problems during kidding can lower a doe's expected life span to 10 or 11, and stresses of going into rut can lower a buck's expected life span to eight to 10 years.