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Compared to other artiodactyls, a pig's head is relatively long and pointed. Most even-toed ungulates are herbivorous, but pigs are omnivores, like their wild relative. When used as livestock, pigs are farmed primarily for the production of meat, called pork. A group of pigs is called a passel, a team, or a sounder. The animal's bones, hide, and bristles are also used in products. Pigs, especially miniature breeds, are kept as pets. The pig typically has a large head, with a long snout which is strengthened by a special prenasal bone and a disk of cartilage at the tip. The snout is used to dig into the soil to find food and is a very acute sense organ. The dental formula of adult pigs is 3.1.4.3 3.1.4.3, giving a total of 44 teeth. In the male, the canine teeth can form tusks, which grow continuously and are sharpened by constantly being ground against each other. įour hoofed toes are on each foot, with the two larger central toes bearing most of the weight, but the outer two also being used in soft ground. Most pigs have rather a bristled sparse hair covering on their skin, although woolly-coated breeds such as the Mangalitsa exist. Pigs possess both apocrine and eccrine sweat glands, although the latter appear limited to the snout and dorsonasal areas. Pigs, however, like other "hairless" mammals (e.g. Pigs are also less able than many other mammals to dissipate heat from wet mucous membranes in the mouth through panting.Įlephants, rhinos, and mole-rats), do not use thermal sweat glands in cooling. Their thermoneutral zone is 16 to 22 ☌ (61 to 72 ☏). At higher temperatures, pigs lose heat by wallowing in mud or water via evaporative cooling, although it has been suggested that wallowing may serve other functions, such as protection from sunburn, ecto-parasite control, and scent-marking. Pigs are one of four known mammalian species which possess mutations in the nicotinic acetylcholine receptor that protect against snake venom. Mongooses, honey badgers, hedgehogs, and pigs all have modifications to the receptor pocket which prevents the snake venom α-neurotoxin from binding. These represent four separate, independent mutations. Pigs have small lungs in relation to their body size, and are thus more susceptible than other domesticated animals to fatal bronchitis and pneumonia. The genome of the pig has been sequenced and contains about 22,342 protein-coding genes. The pig is most often considered to be a subspecies of the wild boar, which was given the name Sus scrofa by Carl Linnaeus in 1758 following from this, the formal name of the pig is Sus scrofa domesticus. However, in 1777, Johann Christian Polycarp Erxleben classified the pig as a separate species from the wild boar. He gave it the name Sus domesticus, which is still used by some taxonomists.
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The American Society of Mammalogists considers it a separate species. HistoryĪrchaeological evidence suggests that pigs were domesticated from wild boar in the Near East in the Tigris Basin, Çayönü, Cafer Höyük, Nevalı Çori being managed in the wild in a way similar to the way they are managed by some modern New Guineans. © 2015-2022.Remains of pigs have been dated to earlier than 11,400 years ago in Cyprus. All models appearing on this website are over 18 y.o.
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