This has resulted in lower production costs, but can cause significant cruelty problems. As consumers have become concerned with humane treatment of livestock, demand for pasture-raised pork in these nations has increased. Vietnamese pot-bellied pigs , a miniature breed of domestic pig , have made popular pets in the United States, beginning in the latter half of the 20th century. These crossbred miniature pigs soon gained attention, even more so than the original Vietnamese pot-bellied. As a result of this, many pet pigs are now of unknown genetic descent. Domestic pigs are highly intelligent, social creatures.
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They are considered hypoallergenic , and are known to do quite well with people who have usual animal allergies. Since these animals are known to have a life expectancy of 15 to 20 years, they require a long-term commitment. Male and female swine that have not been de-sexed may express unwanted aggressive behavior, and are prone to developing serious health issues.
Male pigs, especially when left unaltered, can grow large, sharp tusks which may continue growing for years. Domestic owners may wish to keep their pigs' tusks trimmed back,  or have them removed entirely. As prey animals, pigs' natural instinctive behavior causes them to have a strong fear of being picked up, but they will usually calm down once placed back onto the ground. This instinctual fear may be lessened if the pig has been frequently held since infancy.
When holding a pig, supporting it under the legs makes being held not as stressful for the animal. While some owners are known to pierce their pigs' noses to discourage rooting behaviour, the efficacy and humaneness of this practice is questionable. The domestic pig, both as a live animal and source of post-mortem tissues, is one of the most valuable animal models used in biomedical research today, because of its biological, physiological and anatomical similarities to human beings.
They are also used in the development of medical instruments and devices, surgical techniques and instrumentation, and FDA-approved research. As part of animal conservation The Three Rs animals , these animals contribute to the reduction methods for animal research, as they supply more information from fewer animals used, for a lower cost.
Pigs are currently thought to be the best non-human candidates for organ donation to humans.
world of pigs
The risk of cross-species disease transmission is decreased because of their increased phylogenetic distance from humans. To date, no xenotransplantation trials have been entirely successful due to obstacles arising from the response of the recipient's immune system —generally more extreme than in allotransplantations , ultimately results in rejection of the xenograft , and in some cases result in the death of the recipient—including hyperacute rejection , acute vascular rejection, cellular rejection and chronic rejection. An early major breakthrough was the 1,3 galactosyl transferase gene knockout.
Examples of viruses carried by pigs include porcine herpesvirus , rotavirus , parvovirus , and circovirus. Of particular concern are PERVs porcine endogenous retroviruses , vertically transmitted microbes that embed in swine genomes. The risks with xenosis are twofold, as not only could the individual become infected, but a novel infection could initiate an epidemic in the human population. Because of this risk, the FDA has suggested any recipients of xenotransplants shall be closely monitored for the remainder of their life, and quarantined if they show signs of xenosis.
Because the domestic pig is a major domesticated animal , English has many terms unique to the species:. From Wikipedia, the free encyclopedia.
Pigs, Hogs & Boars: Facts About Swine
For other uses, see Swine disambiguation. Conservation status. Erxleben , Main article: List of pig breeds. Main article: Pig farming.
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Main article: Xenotransplantation. This section does not cite any sources. Please help improve this section by adding citations to reliable sources.
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The importance of stimulation of the anterior teats. Maintenance of teatorder with some evidence for the use of odour cues". Retrieved 9 December Archived from the original on 26 December Iowa State University Press, Ames. The social behaviour of pigs. In "Social Behaviour in Farm Animals", eds. Keeling, L. CABI, Oxford. Journal of Chemical Ecology.
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Retrieved 2 July Retrieved 15 April Retrieved 7 May Mini Pig Info. Retrieved 27 January Pig skin is structurally similar to human epidermal thickness and dermal-epidermal thickness ratios. Pigs and humans have similar hair follicle and blood vessel patterns in the skin.
Biochemically, pigs contain dermal collagen and elastic content that is more similar to humans than other laboratory animals. Finally, pigs have similar physical and molecular responses to various growth factors.