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What Is Livestock Farming?

Livestock farming is the practice of raising domesticated animals — cattle, pigs, chickens, sheep, goats, and others — for food products (meat, milk, eggs), fiber (wool, leather), labor (draft animals), and other uses. It’s one of the oldest human activities, dating back roughly 10,000 years to when people first domesticated sheep and goats in the Fertile Crescent.

Today, livestock farming is a massive global industry. About 1.3 billion people work in livestock production worldwide. The sector generates roughly $1.4 trillion in revenue annually and provides about a third of humanity’s protein intake. It’s also one of the most debated sectors in food production, caught between feeding a growing population and managing serious environmental consequences.

The Major Livestock Animals

Cattle — about 1 billion worldwide. Raised for beef, dairy, and leather. The U.S., Brazil, and the EU are the largest producers. A single dairy cow produces roughly 2,600 gallons of milk per year in the U.S. — more than triple the output of 50 years ago, thanks to selective breeding and improved nutrition.

Pigs — roughly 780 million globally. China produces nearly half the world’s pork. Pigs are efficient converters of feed to meat, reaching market weight (about 280 pounds) in roughly six months. They’re also remarkably intelligent — smarter than dogs by most cognitive measures.

Chickens — approximately 34 billion alive at any time. Raised for both meat (broilers) and eggs (layers). The modern broiler chicken reaches market weight in about 42 days, down from 70 days in the 1960s. The U.S. alone produces about 9 billion broiler chickens annually.

Sheep — about 1.2 billion worldwide. Raised for meat (lamb and mutton), wool, and milk. Australia, China, and New Zealand are top producers. A single sheep produces 6-18 pounds of wool per year, depending on breed.

Goats — roughly 1 billion globally. More popular in developing countries than in Western nations. Goats are hardy, adaptable, and can thrive on vegetation that cattle won’t touch. Goat milk and cheese are growing in popularity in Western markets.

Farming Systems

Extensive (Pastoral) Farming

Animals graze on large areas of natural or semi-natural grassland. This is the traditional model — ranching in the American West, sheep stations in Australia, pastoral herding in East Africa. Stocking densities are low, animals move freely, and feed comes primarily from grazing.

The advantages are lower infrastructure costs, better animal welfare (by most measures), and the ability to use land that’s unsuitable for crops. The disadvantages are lower productivity per animal, higher land requirements, and vulnerability to drought and weather.

Intensive (Industrial) Farming

Concentrated animal feeding operations (CAFOs) house large numbers of animals in confined spaces. A single broiler house might contain 20,000-30,000 chickens. A large hog operation might hold 10,000+ pigs. Feed is brought in rather than grazed, and every aspect of the environment — temperature, lighting, ventilation — is controlled.

Intensive farming produces more meat, milk, and eggs per unit of input. It’s why chicken costs $3 per pound instead of $15. But the trade-offs are significant: animal welfare concerns, antibiotic resistance (U.S. livestock receive about 70% of all antibiotics sold in the country), water pollution from concentrated waste, and air quality issues for surrounding communities.

Mixed Farming

Many farms combine livestock with crop production. Animals graze on crop residues, manure fertilizes fields, and the two systems support each other. This was the dominant model for most of agricultural history and remains common in developing countries and among smaller operations in wealthy nations.

The Economics

Livestock farming economics are brutal. Margins are thin, input costs (feed, veterinary care, energy, labor) are volatile, and market prices fluctuate unpredictably. In the U.S., the average net income for beef cattle operations ranges from modestly profitable to outright negative in bad years.

Scale matters enormously. The industry has consolidated dramatically — in the U.S., four companies control about 85% of beef packing, and the average hog farm is 30 times larger than in 1990. Small farmers increasingly can’t compete on price, pushing many toward niche markets (organic, grass-fed, heritage breeds) or out of farming entirely.

Government subsidies, crop insurance programs, and trade policies heavily influence livestock economics. The U.S. government spends billions annually on programs that directly or indirectly support livestock production, from feed crop subsidies to grazing leases on public land.

Environmental Impact

This is where the debate gets heated. Livestock farming is responsible for approximately 14.5% of global greenhouse gas emissions, according to the FAO. Cattle are the biggest contributors, producing methane through enteric fermentation (essentially, burping) — methane is about 80 times more potent than CO2 as a greenhouse gas over a 20-year period.

Beyond emissions, livestock farming drives deforestation (especially in the Amazon, where cattle ranching is the leading cause of forest loss), consumes about 8% of global freshwater, and generates enormous quantities of waste that can contaminate waterways.

But — and this is important context — not all livestock farming has the same impact. Grass-fed cattle on existing pastureland produce far less environmental damage than feedlot cattle eating grain grown on deforested land. Chickens have a much smaller footprint per calorie than beef. And in many regions, livestock grazing on marginal land is the most efficient food production option available.

The Future

Several forces are reshaping livestock farming simultaneously:

Alternative proteins — plant-based and cultivated meat products are growing, though they still represent a tiny fraction of the market. Global meat consumption continues to rise, driven by population growth and rising incomes in developing countries.

Precision agriculture — GPS tracking, automated feeding systems, genetic testing, and health monitoring are making livestock farming more efficient and reducing waste.

Regulatory pressure — the EU has been tightening animal welfare and environmental regulations. Some countries are exploring livestock reduction policies.

Consumer demand shifts — growing interest in animal welfare, environmental sustainability, and health is driving demand for pasture-raised, organic, and antibiotic-free products, even as conventional production continues to dominate by volume.

Livestock farming isn’t disappearing. But how it’s done — and at what scale — is likely to change significantly in the coming decades.

Frequently Asked Questions

What is the most common livestock animal in the world?

Chickens, by a wide margin. There are roughly 34 billion chickens alive at any given time, compared to about 1 billion cattle, 1 billion sheep, and 780 million pigs. Chickens are raised on every continent except Antarctica and provide both meat and eggs.

What is the difference between pasture-raised and factory-farmed livestock?

Pasture-raised animals spend significant time outdoors on grassland, eating natural forage. Factory-farmed animals (in concentrated animal feeding operations, or CAFOs) are kept in confined indoor spaces and fed processed feed. The differences affect animal welfare, environmental impact, product quality, and cost — pasture-raised products typically cost more but have lower environmental intensity per acre.

How much of the world's agricultural land is used for livestock?

About 77% of global agricultural land is used for livestock and feed crops, according to the FAO. However, this land produces only about 18% of the world's calories and 37% of its protein. Much of this land, though, is marginal grassland unsuitable for crop production.

Further Reading

• USDA Economic Research Service: Animal Products
• FAO Livestock and Environment
• EPA Agriculture: Animal Feeding Operations