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Swine have a keen ability to recognize other pigs as well as humans. This is critical to them because they are such social animals. The main way that they can recognize other pigs is by smell. Their olfactory senses are extremely developed. This ability is what allows swine to have their developed social organization.

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Swine have been known to use around 20 different sounds to communicate with each other. A grunt is one of the most common sounds and it is usually used to respond to familiar sounds. A short grunt is common when a pig is excited, while a long grunt is usually used as a contact call to other swine. Squeals and screams are used when the pig is startled or hurt.

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Swine are usually violent animals. They are known to attack any new pigs that are introduced to their group. This mentality has been seen as early in life as one week after birth. Piglets born in confined conditions have been observed attacking new piglets just one week after being born. This is why many swine specialists do not recommend introducing a new pig into a pen of already established pigs.

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It has been proven that the social status of sows is directly linked to the size of their piglets.

A dominant sow will generally have heavier, healthier piglets. Sows that have a lower social status will have lighter, weaker piglets generally.

This is because the sows that are dominant are able to eat and drink as much as they please. This allows their piglets to have the optimum circumstances for development.

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The courting of a female by a male only lasts a short time. The male sniffs the female, noses sides, flanks and vulva. The male makes a sort of "mating" call that is made up of guttural grunts. The female first bites the male's ear and then stands to be mounted.

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Ultra Massive Pigs Mating ★ Life of Pigs

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Ultra Aggressive Pig Mating ★ Life of Pigs

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Uploaded by Dusama Animals on 2016-08-26.

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A study on sexual behavior was done that kept a male pig in social isolation for the majority of its life. These pigs then showed poorer sexual performance than the pigs that were not raised in social isolation (Price, 109). Scientists then deduced that social isolation is important to the sexual performance of a pig.

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These steroids have been tested with cattle, swine and sheep to determine whether this is the chemical that causes males to act the way they do when mating. After prolonged treated, the females of each of the three species have shown the same mounting behaviors as the males.

https://dl.sciencesocieties.org/publications/jas/abstracts/67/7/JAN0670071816

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The social structure of feral pigs is a matriarchal herd of several females and their offspring, called a sounder. Males are not permanently associated with such herds. These males either live solitarily or with a group of other males.

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Boars, unlike many male species, show no preference between an oestrous and anoestrous sow. This means that the sow plays a critical role in the meeting of the two sexual partners. The sow has to come meet the boar and show it that it is ready to engage in sexual behavior.

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Pigs have a panoramic vision range of about 310 degrees. Pigs are also able to somewhat see in color. Because pigs have such good vision traits, any significant change in visual stimuli can affect their mating habits. If a female is beyond a transitional contrast point, or somewhere where the light changes significantly, it can change the sexual behavior of the male.

http://livestocktrail.illinois.edu/swinerepronet/paperDisplay.cfm?ContentID=6282