Pigs are one of the most versatile and consequential animals in human civilization. They feed billions of people, supply critical pharmaceutical ingredients, serve as stand-ins for the human body in medical research, and are now at the frontier of organ transplantation. Their importance stretches back roughly 11,000 years, when they were first domesticated in Eastern Anatolia, and their role in human life has only expanded since.
A Major Global Protein Source
Pork is the second most consumed meat on the planet. In 2022, 34% of all meat eaten worldwide was pork, just behind poultry at 40% and well ahead of beef at 22%. Global pork consumption reached 113 million metric tons that year, a 77% increase from 63.5 million tons in 1990.
Beyond sheer volume, pork is a nutritionally dense food. A 100-gram serving of cooked lean pork delivers 0.66 mg of thiamine (vitamin B1), which is more than half the daily recommended intake and far more than most other meats provide. The same serving contains 45.3 micrograms of selenium, an antioxidant mineral important for thyroid function and immune health, plus 0.56 micrograms of vitamin B12. In many parts of the world, particularly in East Asia and Europe, pork is a dietary staple that provides affordable, accessible nutrition at a scale no other livestock animal matches.
Lifesaving Pharmaceutical Ingredients
One of the most critical drugs in modern medicine comes directly from pigs. Heparin, a blood-thinning medication used since the 1930s, is extracted from the lining of pig intestines. It is the second most widely used natural therapeutic agent after insulin, and every heparin product currently approved in the United States is sourced from porcine intestinal tissue, with the majority imported from China.
Heparin’s medical applications are remarkably broad. It is essential for kidney dialysis, open-heart surgery, treatment of heart attacks and strokes, management of deep vein thrombosis and pulmonary embolism, and coating of medical devices to prevent clotting. Without a reliable supply of pig-derived heparin, many routine hospital procedures would become far more dangerous. The global healthcare system’s dependence on this single pig-sourced compound is so deep that supply disruptions, like a 2008 contamination crisis linked to Chinese producers, have triggered international concern.
Pigs also supply porcine-derived heart valves used in human patients. These bioprosthetic valves are a common alternative to mechanical valves because they don’t require lifelong blood-thinning medication. About 40% of first-generation porcine heart valves remained free of structural deterioration at 18 years, and durability improves significantly with patient age. In patients over 70, only about 10% of valves showed degeneration at the 10-year mark.
The Best Stand-In for the Human Body
Pig hearts are strikingly similar to human hearts in size, anatomy, and function. Their coronary arteries follow the same branching pattern as ours, with comparable left anterior descending, left circumflex, and right coronary arteries. This anatomical overlap is so precise that standard human diagnostic and surgical equipment works in pigs without modification.
This makes pigs indispensable for cardiovascular research. Scientists use porcine models to develop and test coronary stents, study how arteries narrow and reclose after procedures, and practice complex surgical techniques before performing them on patients. Smaller animal models like mice are useful for early-stage discoveries, but their physiology is too different from humans to bridge the gap between laboratory findings and real clinical treatments. Pigs fill that gap better than any other animal.
Surgeons also train on pig organs to master techniques for bifurcation stenting (where arteries branch), chronic total occlusion (completely blocked arteries), and advanced coronary imaging. The realism of these practice sessions directly translates to better outcomes in human operating rooms.
Pioneers of Organ Transplantation
More than 100,000 people in the United States are waiting for organ transplants at any given time, and thousands die each year before one becomes available. Pigs may offer a solution. In a landmark procedure, surgeons at Massachusetts General Hospital transplanted a genetically edited pig kidney into a living human patient for the first time.
The kidney required 69 individual genetic edits using CRISPR technology. Those modifications did three things: removed pig genes that produce sugars our immune system would attack, added human genes to improve compatibility, and inactivated viruses embedded in the pig genome that could otherwise infect the recipient. This combination of changes addressed the three major barriers that had blocked pig-to-human transplants for decades.
Pig organs are promising candidates for this kind of transplantation because they are roughly the right size for human bodies and can be produced in large numbers under controlled conditions. If the technology matures, it could effectively eliminate organ donor shortages for kidneys, hearts, and other organs.
Agricultural Value Beyond Meat
Pig manure is a significant source of crop fertilizer, supplying nitrogen, phosphorus, and potassium in ratios that vary by the pig’s life stage. Manure from growing and finishing pigs, for example, contains about 0.80% total nitrogen, 0.45% phosphorus, and 0.25% potassium. A single grow-finish pig produces roughly 2,100 pounds of solid manure per year, making pig operations a substantial source of organic fertilizer for nearby farmland.
This nutrient recycling reduces the need for synthetic fertilizers, which require large amounts of energy to produce. When managed properly, pig manure also adds organic matter to soil, improving its structure, water retention, and long-term productivity. In integrated farming systems, pigs convert food waste and crop byproducts into both protein and fertilizer, closing nutrient loops that would otherwise depend entirely on industrial inputs.
A History Older Than Civilization
Pigs were among the earliest animals domesticated by humans. Archaeological and genetic evidence points to at least two independent domestication events: one in Eastern Anatolia (modern-day Turkey) around 9,000 BC, and another in central China around 5,000 BC. From Anatolia, domesticated pigs spread into Europe alongside early Neolithic farming communities beginning around 5,000 BC.
This dual origin means pigs have been deeply embedded in both Western and East Asian food systems for thousands of years, shaping cuisines, economies, and agricultural practices on two continents independently. Their adaptability to different climates, their omnivorous diet, and their rapid reproduction rate made them ideal livestock for early farming societies, and those same traits continue to make them efficient to raise today.