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60-450: The Kunekune ( Māori pronunciation: [kʉnɛkʉnɛ] ) is a small breed of domestic pig from New Zealand . Kunekune are hairy with a rotund build, and may bear wattles hanging from their lower jaws. Their colour ranges from black and white, to ginger, cream, gold-tip, black, brown, and tricoloured. They have a docile, friendly nature. The breed is believed to have descended from an Asian domestic breed introduced to New Zealand in

120-649: A cloven hoof . Most of these cloven-hooved animals also have two smaller hooves called dewclaws a little further up the leg – these are not normally used for walking, but in some species with larger dewclaws (such as deer and pigs) they may touch the ground when running or jumping, or if the ground is soft. In the mountain goat, the dewclaw serves to provide extra traction when descending rocky slopes as well as additional drag on loose or slippery surfaces made of ice, dirt, or snow. Other cloven-hooved animals (such as giraffes and pronghorns ) have no dewclaws. In some so-called "cloven-hooved" animals, such as camels ,

180-488: A healthy, full-grown adult. Vietnamese Pot-bellied pigs, a miniature breed of pig , have been kept as pets in the United States, beginning in the latter half of the 20th century. Pigs are intelligent, social creatures. They are considered hypoallergenic and are known to do quite well with people who have the usual animal allergies. Since these animals are known to have a life expectancy of 15 to 20 years, they require

240-485: A large head, with a long snout 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 an acute sense organ. The dental formula of adult pigs is 3.1.4.3 3.1.4.3 , giving a total of 44 teeth . The rear teeth are adapted for crushing. In males, the canine teeth can form tusks , which grow continuously and are sharpened by grinding against each other. There are four hoofed toes on each foot;

300-453: A litter of piglets, once per year. By the nineteenth century, European piglets routinely double-farrowed, or bore two litters of piglets per year. It is unclear when this shift occurred. Pigs have a maximum life span of about 27 years. A characteristic of pigs which they share with carnivores is nest-building . Sows root in the ground to create depressions the size of their body, and then build nest mounds, using twigs and leaves, softer in

360-534: A long-term commitment. Given pigs are bred primarily as livestock and have not been bred as companion animals for very long, selective breeding for a placid or biddable temperament is not well established. Pigs have radically different psychology and behaviours compared to dogs, and exhibit fight-or-flight instincts, an independent nature, and natural assertiveness . Male and female swine that have not been de-sexed may express unwanted aggressive behavior, and are prone to developing serious health issues. As rooting

420-489: A medium to short, slightly upturned snout, often black, and either semilopped or pricked ears. It has a short, round body with short legs and may have two wattles (called piri piri ) under its chin. The Kunekune stands about 60 cm (24 in) tall. An adult Kunekune can weigh between 60 and 200 kg (130 and 440 lb), males being considerably heavier than females. Kunekune can be kept as pets in New Zealand and are

480-556: A now extinct ghost population of wild pigs during the Pleistocene . The genomes of domestic pigs show strong selection for genes affecting behavior and morphology. Human selection for domestic traits likely counteracted the homogenizing effect of gene flow from wild boars and created domestication islands in the genome. Pigs arrived in Europe from the Near East at least 8,500 years ago. Over

540-484: A recognised breed of miniature pig . Kunekune cannot be imported into Australia , as Australia does not allow the import of live pigs for biosecurity reasons. However, breeders have created an alternative Australian breed: the Australian miniature pig. Domestic pig The pig ( Sus domesticus ), also called swine ( pl. : swine) or hog , is an omnivorous , domesticated , even-toed, hoofed mammal . It

600-666: A separate species. Archaeological evidence shows that pigs were domesticated from wild boar in the Near East in or around the Tigris Basin, being managed in a semi-wild state much as they are managed by some modern New Guineans. There were pigs in Cyprus more than 11,400 years ago, introduced from the mainland, implying domestication in the adjacent mainland by then. Pigs were separately domesticated in China, starting some 8,000 years ago. In

660-468: A short time and then sleep for a short time. Pigs are omnivorous and versatile in their feeding behaviour. They primarily eat leaves, stems, roots, fruits, and flowers. Rooting is an instinctual comforting behaviour in pigs characterized by nudging the snout into something. It first happens when piglets are born to obtain their mother's milk, and can become a habitual, obsessive behaviour, most prominent in animals weaned too early. Pigs root and dig into

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720-403: A shoulder height of 1.5 m (4 ft 11 in). Pigs possess both apocrine and eccrine sweat glands , although the latter are limited to the snout. Pigs, like other "hairless" mammals such as elephants, do not use thermal sweat glands in cooling. Pigs are less able than many other mammals to dissipate heat from wet mucous membranes in the mouth by panting. Their thermoneutral zone

780-456: A simplified, crowded, or uncomfortable environment may resort to tail-biting ; farmers sometimes dock the tails of pigs to prevent the problem, or may enrich the environment with toys or other objects to reduce the risk. Because of their relative lack of sweat glands, pigs often control their body temperature using behavioural thermoregulation. Wallowing , coating the body with mud, is a common behaviour. They do not submerge completely under

840-488: A target on screen. Pigs have panoramic vision of approximately 310° and binocular vision of 35° to 50°. It is thought they have no eye accommodation . Other animals that have no accommodation, e.g. sheep, lift their heads to see distant objects. The extent to which pigs have colour vision is still a source of some debate; however, the presence of cone cells in the retina with two distinct wavelength sensitivities (blue and green) suggests that at least some colour vision

900-414: A teat, the more milk that teat later releases. In pigs, dominance hierarchies are formed at an early age. Piglets are precocious, and attempt to suckle soon after being born. The piglets are born with sharp teeth and fight for the anterior teats, as these produce more milk. Once established, this teat order remains stable; each piglet tends to feed on a particular teat or group of teats. Stimulation of

960-481: A year, usually in spring or early summer, to prepare for the warmer months ahead. Where pigs are allowed to roam freely, they walk roughly 4 km daily, scavenging within a home range of around a hectare. Farmers in Africa often choose such a low-input, free-range production system. If conditions permit, pigs feed continuously for many hours and then sleep for many hours, in contrast to ruminants , which tend to feed for

1020-499: Is 16–22 °C (61–72 °F). 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 among four mammalian species with mutations in the nicotinic acetylcholine receptor that protect against snake venom . Mongooses , honey badgers , hedgehogs , and pigs all have different modifications to

1080-475: Is especially an issue in southeastern South America. Female pigs reach sexual maturity at 3–12 months of age and come into estrus every 18–24 days if they are not successfully bred. The variation in ovulation rate can be attributed to intrinsic factors such as age and genotype, as well as extrinsic factors like nutrition, environment, and the supplementation of exogenous hormones. The gestation period averages 112–120 days. Estrus lasts two to three days, and

1140-420: Is found to be comforting, pigs kept in the house may root household objects, furniture or surfaces. Pet pigs should be let outside to allow them to fulfill their natural desire of rooting around. Approximately 1.5 billion pigs are slaughtered each year for meat. The pork belly futures contract became an icon of commodities trading . It appears in depictions of the arena in popular entertainment, such as

1200-450: 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 , still used by some taxonomists. The American Society of Mammalogists considers it

1260-628: Is named the domestic pig when distinguishing it from other members of the genus Sus . It is considered a subspecies of Sus scrofa (the wild boar or Eurasian boar) by some authorities, but as a distinct species by others. Pigs were domesticated in the Neolithic , both in East Asia and in the Near East. When domesticated pigs arrived in Europe, they extensively interbred with wild boar but retained their domesticated features. Pigs are farmed primarily for meat, called pork . The animal's skin or hide

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1320-400: Is present. Pigs have a well-developed sense of smell; this is exploited in Europe where trained pigs find underground truffles . Pigs have 1,113 genes for smell receptors, compared to 1,094 in dogs; this may indicate an acute sense of smell, but against this, insects have only around 50 to 100 such genes but make extensive use of olfaction. Olfactory rather than visual stimuli are used in

1380-522: Is used for leather . China is the world's largest pork producer, followed by the European Union and then the United States. Around 1.5 billion pigs are raised each year, producing some 120 million tonnes of meat, often cured as bacon . Some are kept as pets . Pigs have featured in human culture since Neolithic times, appearing in art and literature for children and adults, and celebrated in cities such as Bologna for their meat products. The pig has

1440-557: The Midwest , where many state agencies have programs to remove them. Feral pigs in New Zealand and northern Queensland have caused substantial environmental damage. Feral hybrids of the European wild boar with the domestic pig are disruptive to both environment and agriculture, as they destroy crops, spread animal diseases including Foot-and-mouth disease , and consume wildlife such as juvenile seabirds and young tortoises . Feral pig damage

1500-455: The tick -borne African Swine Fever , bacterial infections such as Clostridium , arthritis caused by Mycoplasma , and stillbirths caused by Parvovirus . Some parasites of pigs are a public health risk as they can be transmitted to humans in undercooked pork. These are the pork tapeworm Taenia solium ; a protozoan, Toxoplasma gondii ; and a nematode, Trichinella spiralis . Transmission can be prevented by thorough sanitation on

1560-560: The "hoof" is not properly a hoof – it is not a hard or rubbery sole with a hard wall formed by a thick nail – instead it is a soft toe with little more than a nail merely having an appearance of a hoof. Some odd-toed ungulates ( equids ) have one hoof on each foot; others have (or had) three distinct hooved or heavily nailed toes, or one hoof and two dewclaws. The tapir is a special case, having three toes on each hind foot and four toes on each front foot. Hooves grow continuously. In nature, wild animals are capable of wearing down

1620-472: The 1983 film Trading Places . Trade in pork bellies declined, and they were delisted from the Chicago Mercantile Exchange in 2011. Hoof The hoof surrounds the distal end of the second phalanx , the distal phalanx , and the navicular bone . The hoof consists of the hoof wall , the bars of the hoof, the sole and frog and soft tissue shock absorption structures. The weight of

1680-478: The Near East, pig husbandry spread for the next few millennia. It reduced gradually during the Bronze Age , as rural populations instead focused on commodity-producing livestock, but it was sustained in cities. Domestication did not involve reproductive isolation with population bottlenecks. Western Asian pigs were introduced into Europe, where they crossed with wild boar. There appears to have been interbreeding with

1740-604: The Near Eastern genes dying out in European pig stock. More recently there have been complex exchanges, with European domesticated lines being exported, in turn, to the ancient Near East. Historical records indicate that Asian pigs were again introduced into Europe during the 18th and early 19th centuries. Among the animals that the Spanish introduced to the Chiloé Archipelago in the 16th century Columbian Exchange , pigs were

1800-472: The animal is normally borne by both the sole and the edge of the hoof wall. Hooves perform many functions, including supporting the weight of the animal, dissipating the energy impact as the hooves strike the ground or surface, protecting the tissues and bone within the hoof capsule, and providing traction for the animal. Numerous factors can affect hoof structure and health, including genetics, hoof conformation, environmental influences, and athletic performance of

1860-438: The animal. The ideal hoof has a parallel hoof-pastern axis, a thick hoof wall, adequate sole depth, a solid heel base and growth rings of equal size under the coronary band. There are four layers within the exterior wall of the hoof. From the outside, a hoof is made up of the stratum externum, the stratum medium, the stratum internum and the dermis parietis. The stratum externum and the stratum medium are difficult to distinguish,

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1920-553: The anterior teats appears to be important in causing milk letdown, so it might be advantageous to the entire litter to have these teats occupied by healthy piglets. Piglets locate teats by sight and then by olfaction. Pig behaviour is intermediate between that of other artiodactyls and of carnivores . Pigs seek out the company of other pigs and often huddle to maintain physical contact, but they do not naturally form large herds. They live in groups of about 8–10 adult sows, some young individuals, and some single males. Pigs confined in

1980-414: The boar's corkscrew-shaped penis during copulation. Females have bicornuate uteruses and two conceptuses must be present in both uterine horns to enable pregnancy to proceed. The mother's body recognises that it is pregnant on days 11 to 12 of pregnancy, and is marked by the corpus luteum 's producing the sex hormone progesterone . To sustain the pregnancy, the embryo signals to the corpus luteum with

2040-699: The breed no longer faces extinction, with breed societies in both New Zealand and the United Kingdom. In 1993, two were imported into the United States from the UK. In 2017, a report of Science Daily said the Kunekune has remarkable social learning with "astonishingly good memory". The Kunekune can sustain itself by feeding in summer on nothing other than grass. The Kunekune is covered in hair which can be long or short, and straight or curly. Hair colours include black, brown, ginger, gold, cream, and spotted combinations. It has

2100-470: The domesticated pig is one of the most numerous large mammals on the planet. Like all animals, pigs are susceptible to adverse impacts from climate change , such as heat stress from increased annual temperatures and more intense heatwaves . Heat stress has increased rapidly between 1981 and 2017 on pig farms in Europe. Installing a ground-coupled heat exchanger is an effective intervention. Around 600 breeds of pig have been created by farmers around

2160-529: The early 19th century by whalers or traders. They differ markedly from the feral pig of European origin known in New Zealand as a "Captain Cooker". The native Māori people of New Zealand adopted Kunekune; kunekune is a Māori word meaning "fat and round". By the 1980s, only an estimated 50 purebred Kunekune remained. Michael Willis and John Simister , wildlife park owners, started a breeding recovery programme, which encouraged other recovery efforts. As of 2010,

2220-408: The equine world, the expression, "no foot, no horse" emphasizes the importance of hoof health. Hoof care is important in the equine industry . Problems that can arise with poor horse hoof care include hoof cracks, thrush, abscesses and laminitis . A cow hoof is cloven, or divided, into two approximately equal parts, usually called claws. Approximately 95% of lameness in dairy cattle occurs in

2280-457: The farm; by meat inspection and careful commercial processing; and by thorough cooking, or alternatively by sufficient freezing and curing. Pigs have been raised outdoors, and sometimes allowed to forage in woods or pastures. In industrialized nations, pig production has largely switched to large-scale intensive pig farming . This has lowered production costs but has caused concern about possible cruelty . As consumers have become concerned with

2340-521: The feet. Lameness in dairy cows can reduce milk production and fertility, and cause reproductive problems and suffering. For dairy farm profitability, lameness, behind only infertility and mastitis , is the third most important cow health issue. Hoof trimmers trim and care for bovine hooves, usually dairy cows . Hooves can be trimmed with a sharp knife while the cow is restrained and positioned with ropes. Professional hoof-trimming tend to use angle grinders and some type of hoof trimming crush to make

2400-417: The female's displayed receptiveness to mate is known as standing heat. Standing heat is a reflexive response that is stimulated when the female is in contact with the saliva of a sexually mature boar. Androstenol is one of the pheromones produced in the submaxillary salivary glands of boars that trigger the female's response. The female cervix contains a series of five interdigitating pads, or folds, that hold

2460-416: The flow stops and so does the grunting of the sow. The piglets may dart from teat to teat and recommence suckling with slow movements, or nosing the udder. Piglets massage and suckle the sow's teats after milk flow ceases as a way of letting the sow know their nutritional status. This helps her to regulate the amount of milk released from that teat in future sucklings. The more intense the post-feed massaging of

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2520-464: The ground to forage for food. Rooting is also a means of communication. Pigs are relatively intelligent animals, roughly on par with dogs . They distinguish each other as individuals, spend time in play, and form structured communities. They have good long-term memory and they experience emotions, changing their behaviour in response to the emotional states of other pigs. In terms of experimental tasks, pigs can perform tasks that require them to identify

2580-446: The herd. This ensures they do not get trampled on, and prevents other piglets from stealing milk from the sow. The onset of nest-building is triggered by a rise in prolactin level, caused by a decrease in progesterone and an increase in prostaglandin; the gathering of nest material seems to be regulated more by external stimuli such as temperature. Pigs have complex nursing and suckling behaviour. Nursing occurs every 50–60 minutes, and

2640-499: The hoof as it continuously grows, but captive domesticated species often must undergo specific hoof care for a healthy, functional hoof. Proper care improves biomechanical efficiency and prevents lameness. If not worn down enough by use, such as in the dairy industry, hooves may need to be trimmed. However, too much wear can result in damage of the hooves, and for this reason, horseshoes and oxshoes are used by animals that routinely walk on hard surfaces and carry heavy weight. Within

2700-480: The hormones estradiol and prostaglandin E2 . This signaling acts on both the endometrium and luteal tissue to prevent the regression of the corpus luteum by activation of genes that are responsible for corpus luteum maintenance. During mid to late pregnancy, the corpus luteum relies primarily on luteinizing hormone for maintenance until birth. Archeological evidence indicates that medieval European pigs farrowed, or bore

2760-458: The humane treatment of livestock, demand for pasture-raised pork in these nations has increased. Most pigs in the US receive ractopamine , a beta-agonist drug , which promotes muscle instead of fat and quicker weight gain, requiring less feed to reach finishing weight, and producing less manure . China has requested that pork exports be ractopamine-free. With a population of around 1 billion individuals,

2820-568: The identification of other pigs. Hearing is well developed; sounds are localised by moving the head. Pigs use auditory stimuli extensively for communication in all social activities. Alarm or aversive stimuli are transmitted to other pigs not only by auditory cues but also by pheromones . Similarly, recognition between the sow and her piglets is by olfactory and vocal cues. Pigs are subject to many pests and diseases which can seriously affect productivity and cause death. These include parasites such as Ascaris roundworms, virus diseases such as

2880-432: The locations of objects; they can solve mazes; and they can work with a simple language of symbols. They display self-recognition in a mirror . Pigs have been trained to associate different sorts of music (Bach and a military march) with food and social isolation respectively, and could communicate the resulting positive or negative emotion to untrained pigs. Pigs can be trained to use a joystick with their snout to select

2940-399: The middle, in which to give birth. When the mound reaches the desired height, she places large branches, up to 2 metres in length, on the surface. She enters the mound and roots around to create a depression within the gathered material. She then gives birth in a lying position, unlike other artiodactyls which usually stand while birthing. Nest-building occurs during the last 24 hours before

3000-443: The most successful in adapting to local conditions. The pigs benefited from abundant shellfish and algae exposed by the large tides of the archipelago. Pigs were brought to southeastern North America from Europe by de Soto and other early Spanish explorers . Escaped pigs became feral . Pigs have escaped from farms and gone feral in many parts of the world. Feral pigs in the southeastern United States have migrated north to

3060-405: The mud, but vary the depth and duration of wallowing depending on environmental conditions. Adult pigs start wallowing once the ambient temperature is around 17–21 °C (63–70 °F). They cover themselves in mud from head to tail. They may use mud as a sunscreen, or to keep parasites away. Most bristled pigs "blow their coat", meaning that they shed most of the longer, coarser stiff hair once

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3120-431: The next 3,000 years they interbred with European wild boar until their genome showed less than 5% Near Eastern ancestry, yet retained their domesticated features. DNA evidence from subfossil remains of teeth and jawbones of Neolithic pigs shows that the first domestic pigs in Europe were brought from the Near East. This stimulated the domestication of local European wild boar, resulting in a third domestication event with

3180-402: The onset of farrowing, and becomes most intense 12 to 6 hours before farrowing. The sow separates from the group and seeks a suitable nest site with well-drained soil and shelter from rain and wind. This provides the offspring with shelter, comfort, and thermoregulation. The nest provides protection against weather and predators, while keeping the piglets close to the sow and away from the rest of

3240-795: The receptor pocket which prevents α-neurotoxin from binding. Pigs have small lungs for 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; it contains about 22,342 protein -coding genes . Domestic pigs are related to other pig species as shown in the cladogram , based on phylogenetic analysis using mitochondrial DNA . Babirusa [REDACTED] Red river hog [REDACTED] Warthogs [REDACTED] Visayan warty pig [REDACTED] Philippine warty pig [REDACTED] Bornean bearded pig [REDACTED] Javan warty pig [REDACTED] [REDACTED] East Asian pigs [REDACTED] European pigs [REDACTED] The pig

3300-469: The sow grunts at slow, regular intervals. Each series of grunts varies in frequency, tone and magnitude, indicating the stages of nursing to the piglets. The phase of competition for teats and of nosing the udder lasts for about a minute, ending when milk begins to flow. The piglets then hold the teats in their mouths and suck with slow mouth movements (one per second), and the rate of the sow's grunting increases for approximately 20 seconds. The grunt peak in

3360-406: The sow requires stimulation from piglets before milk let-down. Sensory inputs (vocalisation, odours from mammary and birth fluids, and hair patterns of the sow) are particularly important immediately post-birth to facilitate teat location by the piglets. Initially, the piglets compete for position at the udder; then the piglets massage around their respective teats with their snouts, during which time

3420-523: The stratum externum is thin and the stratum medium is what makes up the bulk of the hoof wall. Inside the hoof wall is a laminar junction , a soft tissue structure that allows the hoof to withstand the demands of force transmission it undergoes. This tissue structure binds the inner surface of the hoof wall, the dermis parietis and the outer surface of the third phalanx. Most even-toed ungulates (such as sheep , goats , deer , cattle , bison and pigs ) have two main hooves on each foot, together called

3480-452: The third phase of suckling does not coincide with milk ejection, but rather the release of oxytocin from the pituitary into the bloodstream. Phase four coincides with the period of main milk flow (10–20 seconds) when the piglets suddenly withdraw slightly from the udder and start sucking with rapid mouth movements of about three per second. The sow grunts rapidly, lower in tone and often in quick runs of three or four, during this phase. Finally,

3540-492: The two larger central toes bear most of the weight, while the outer two are also used in soft ground. Most pigs have rather sparsely bristled hair on their skin, though there are some woolly -coated breeds such as the Mangalitsa . Adult pigs generally weigh between 140 and 300 kg (310 and 660 lb), though some breeds can exceed this range. Exceptionally, a pig called Big Bill weighed 1,157 kg (2,551 lb) and had

3600-628: The world, mainly in Europe and Asia, differing in coloration, shape, and size. According to The Livestock Conservancy , as of 2016, three breeds of pig are critically rare (having a global population of fewer than 2000). They are the Choctaw hog , the Mulefoot , and the Ossabaw Island hog . The smallest known pig breed in the world is the Göttingen minipig , typically weighing about 26 kilograms (57 lb) as

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