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Sus (genus)

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The genus Sus contains several species of mammals, including the domestic pig and the wild boar. These animals belong to the Suidae family, which is a group of even-toed ungulates.

Domestic pig skull (Sus domesticus)
Domestic pig skull (Sus domesticus)

Today, there are approximately 1 billion individuals of these species living on Earth. This makes the domestic pig one of the most populous large mammals globally. They are highly intelligent animals capable of learning complex tasks. Because of their biological similarities to humans, they are vital to medical science.

A pig's anatomy is specialized for foraging in diverse environments. They possess a long, pointed head and a snout strengthened by a prenasal bone. At the tip of the snout, a disk of cartilage helps them dig into the soil. This snout acts as an acute sense organ to locate food.

Pig hand skeleton
Pig hand skeleton

Their feet are designed for different terrains, with four hooves on each foot. The two large central toes carry most of the weight. The outer two toes provide extra support when walking on soft ground. An adult pig typically has 44 teeth. The rear teeth are adapted for crushing food, while the canine teeth in males grow into continuous tusks.

Pigs are omnivores, meaning they eat both plant and animal matter. In the wild, they forage for roots, tubers, leaves, fruits, and mushrooms. They also eat insects, such as grubs, and occasionally fish or carrion. Pigs are famous for finding truffles, which are valuable mushrooms that grow underground. They use their sense of smell to locate these fungi and unearth them with their snouts.

Wild Pig KSC02pd0873
Wild Pig KSC02pd0873

On modern farms, their diet usually consists of corn and soybean meal. Historically, they were even fed dairy byproducts like whey from cheese making.

The history of the genus Sus is tied closely to human civilization. Domestication likely began as a commensal relationship, where pigs were attracted to human settlements for food scraps. Archaeological evidence suggests pigs were being managed in the Near East as early as 13,000 to 12,700 years ago. In China, early farmers kept pigs in pens to select for faster growth and higher fat content. These Chinese breeds were later brought to Europe. There, they were crossed with local pigs to create many modern breeds.

Domestic pig skull (Sus domesticus)
Domestic pig skull (Sus domesticus)

Pigs are known for being highly fecund, which means they can reproduce very quickly. A single sow, or female pig, can give birth to a litter of twelve or more piglets in one year. This high reproduction rate allows populations to rise rapidly when food is plentiful. However, if wild boars over-forage an area, they can cause nutritional shortages that decrease the population. In some cases, mother pigs may accidentally crush or attack their newborn piglets. It is estimated that about 50% of piglet deaths are caused by the mother during this period.

Beyond food, pigs have provided many materials for human use. Their skin is often used in medical research because it is so similar to human skin. Their coarse hair, known as bristles, has been used for centuries to make brushes. In 1946, the Australian government even launched "Operation Pig Bristle." They flew 28 short tons of bristles from China to support a post-war construction boom.

Pig hand skeleton
Pig hand skeleton

Additionally, pig skin is processed into leather for various products.

Modern science has unlocked even deeper connections between pigs and humans. In November 2012, researchers successfully sequenced the entire genome of the domestic pig. This mapping helps scientists understand human genetic diseases due to our biological similarities. Recent studies also look at pigs as candidates for xenotransplantation, which involves using animal tissues for human medical use.

Wild Pig KSC02pd0873
Wild Pig KSC02pd0873

By studying the pig genome, researchers hope to find new pathways for treating complex human health issues.

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🖼️ Images & Media (3)
File:Domestic pig skull (Sus domesticus).jpg
Domestic pig skull (Sus domesticus).jpg
File:Pig hand skeleton.jpg
Pig hand skeleton.jpg
File:Wild Pig KSC02pd0873.jpg
Wild Pig KSC02pd0873.jpg
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