What Do Pigs Eat? Complete Diet & Feeding Guide

Pigs are true omnivores with one of the most versatile digestive systems in the animal kingdom. Their single-stomach (monogastric) digestive system is remarkably similar to the human digestive tract, which is why pigs can eat such a wide range of foods.

In the wild, feral pigs and their ancestors are opportunistic foragers that spend a large portion of their day rooting through soil and vegetation. Their diet naturally includes roots, tubers, grasses, acorns, fallen fruit, fungi, insects, earthworms, grubs, bird eggs, and occasionally small vertebrates. This rooting behavior is deeply instinctive, and providing opportunities for foraging is important for both physical nutrition and mental enrichment.

Pigs have a keen sense of smell — estimated to be thousands of times more sensitive than the human nose — which they use to locate food underground. Their tough snout is designed for digging, and the rooting instinct is so strong that confined pigs without enrichment often develop destructive behaviors.

Unlike ruminants (cattle, sheep, goats), pigs cannot efficiently digest high-fiber foods like hay and mature grasses. While they can eat and benefit from pasture, they rely primarily on concentrated feeds for their nutritional needs. Fiber does play a role in gut health and satiety, particularly for breeding stock and pet pigs maintained at healthy weights.

Pigs can safely eat a wide variety of supplemental foods. Here is a categorized guide:

Vegetables: Squash, pumpkin, sweet potatoes (raw or cooked), carrots, beets, turnips, broccoli, cauliflower, cabbage, lettuce, kale, peas, green beans, cucumbers, zucchini, and bell peppers. Root vegetables are a particular favorite.

Fruits: Apples (no large amounts of seeds), pears, bananas, watermelon, cantaloupe, berries (strawberries, blueberries, raspberries), grapes, peaches, plums, and cherries (pitted). Fruits are high in sugar, so feed in moderation, especially for pet pigs prone to obesity.

Grains & Legumes: Cooked rice, oats, barley, wheat, corn, and cooked beans or lentils. Grains are a common component of commercial pig feed and provide energy.

Protein: Cooked eggs, cooked fish, and commercial pig feed provide adequate protein. Note: feeding raw meat or meat scraps to pigs is illegal in many jurisdictions due to disease transmission risks (swine vesicular disease, African swine fever).

Pasture & Forage: Fresh grass, clover, alfalfa, dandelions, and other pasture plants provide supplemental nutrition and enrichment. Quality pasture can reduce feed costs by 10-30%.

Key rules: Keep supplemental foods to 10-15% of the total diet. Check local regulations about feeding food waste to pigs, as many areas have restrictions, particularly on anything that has been in contact with meat or dairy products.

Several foods are toxic, illegal, or harmful for pigs:

Toxic foods: Raw potatoes and potato sprouts (solanine), avocado skin and pit (persin), rhubarb leaves (oxalic acid), chocolate and caffeine (theobromine), and large amounts of raw brassicas can interfere with thyroid function.

Regulated foods: In the United States, European Union, Australia, and many other regions, it is illegal to feed pigs meat, meat by-products, or food waste that has been in contact with meat. This includes kitchen scraps from restaurants and homes. The regulation exists to prevent transmission of serious diseases like African swine fever and foot-and-mouth disease. Fines for violations can be substantial.

Moldy or spoiled food: Mycotoxins from moldy grain and feed are a leading cause of illness in pigs. Aflatoxins, fumonisins, and vomitoxin can cause liver damage, reduced growth, reproductive failure, and death. Never feed grain or produce that shows signs of mold.

Highly salty or processed foods: Excess salt causes salt poisoning in pigs, which can be fatal. Avoid chips, processed snacks, cured meats (if legal in your area), and salty leftovers.

Raw eggs: While cooked eggs are fine, raw egg whites contain avidin, which can interfere with biotin absorption over time.

Fruit pits and large seeds: Cherry pits, peach pits, and apple seeds contain cyanogenic compounds. Remove pits and cores before feeding these fruits.

Pig nutritional needs change dramatically with age and purpose.

Nursing piglets (0-3 weeks): Rely almost entirely on sow's milk. Creep feed (a highly palatable starter) can be introduced from about 7-10 days of age to begin familiarizing piglets with solid food and ease the weaning transition.

Weaners (3-8 weeks): After weaning, piglets need a high-protein starter feed with 20-22% protein. This phase is critical — stress from weaning combined with an immature digestive system makes feed quality and palatability essential. Feed should be offered free-choice in small, frequent amounts.

Growers (8-16 weeks, ~50-130 lbs): Transition to a grower feed with 16-18% protein. Pigs grow rapidly during this phase and feed efficiency is highest. Most growers eat approximately 5-7 pounds of feed per day.

Finishers (16-24 weeks, ~130-280 lbs): Switch to a finisher feed with 14-16% protein. Energy density remains high to support weight gain, but protein percentage drops as the rate of lean tissue growth slows. Market-weight pigs may consume 6-9 pounds of feed per day.

Breeding sows: Gestating sows need a controlled diet (typically 4-6 lbs per day of a 14-15% protein feed) to prevent obesity while supporting fetal development. Lactating sows need significantly more feed (12-18 lbs per day) with higher protein (16-18%) to support milk production.

Pet/mini pigs: Pet pigs are highly prone to obesity. Feed a commercially formulated mini pig feed according to body condition, not appetite. Most adult mini pigs eat 1-2% of their body weight in feed per day, divided into two meals. Supplement with vegetables for volume and enrichment.

Commercial pig feed is formulated to meet the specific nutritional needs of pigs at each life stage.

Pig starter: High-protein (20-22%), highly palatable feed designed for weanling piglets. Often contains milk products and specialty ingredients to ease the transition from sow's milk. More expensive per pound but critical for early growth.

Grower feed: Medium-protein (16-18%) feed for pigs from approximately 50 to 130 pounds. Balances protein for lean growth with energy for weight gain. The most cost-effective growth phase.

Finisher feed: Lower-protein (14-16%) feed for pigs approaching market weight. Designed to add finish weight efficiently. Feed conversion rates typically range from 3:1 to 4:1 (pounds of feed per pound of gain).

Sow/Breeding feed: Specialized formulas for gestating and lactating sows with appropriate vitamin and mineral profiles for reproduction, including higher levels of folic acid, iron, and calcium.

Mini pig/Pet pig feed: Lower-calorie formulations designed for pet pig breeds that are prone to obesity. Higher fiber content promotes satiety without excess calories.

Feed forms: Pigs can eat mash, pellets, or crumbles. Pelleted feed generally results in less waste and slightly better feed conversion. Wet feeding (adding water to feed) is common on some farms and can improve palatability and reduce dust.

Cost: Pig feed costs vary significantly by region and formulation. Budget approximately $15-$25 per 50-pound bag for conventional feed, with organic and specialty feeds costing more.

Complete commercial pig feeds are formulated to meet all essential nutrient requirements, but some situations call for additional supplementation:

Salt: Pigs have a specific dietary requirement for salt (sodium chloride). Most commercial feeds include adequate salt, but pigs on homemade or supplemented diets may need a salt block or loose salt. Deficiency causes poor appetite and growth; excess causes toxicity — balance is important.

Iron: Newborn piglets are born with limited iron stores and sow's milk is low in iron. An iron injection (typically iron dextran) at 3-5 days of age is standard practice to prevent iron-deficiency anemia. Outdoor pigs with access to soil may partially self-supplement.

Selenium and Vitamin E: Deficiency causes white muscle disease (mulberry heart disease) in young pigs. Selenium levels vary by soil region, and supplementation is important in selenium-deficient areas.

Calcium and Phosphorus: Important for skeletal development and eggshell-like structures are not a concern, but breeding sows have higher calcium needs. The calcium-to-phosphorus ratio should be approximately 1.2:1 to 1.5:1.

Lysine: The first limiting amino acid in typical corn-soybean pig diets. Adequate lysine is critical for lean muscle growth. Most quality commercial feeds are formulated with sufficient lysine.

Probiotics and prebiotics: Growing evidence supports the use of probiotics for gut health in pigs, particularly around weaning when digestive stress is highest.

Pig feeding should be adjusted throughout the year:

Winter: Pigs need more calories in cold weather to maintain body temperature. Increase feed rations by 10-25% during cold snaps. Ensure water does not freeze — pigs drink 2-5 gallons per day and dehydration quickly reduces feed intake. Bedding quality matters too, as pigs lying on cold, wet ground burn more calories for warmth.

Spring: As temperatures moderate, reduce feed quantities back to baseline. Spring is a common farrowing season, so lactating sows need maximum nutritional support. Pasture access returns, providing supplemental nutrition and enrichment.

Summer: Heat stress is a serious concern for pigs, which lack effective sweat glands and rely on wallowing, shade, and panting to cool down. Feed intake naturally drops in hot weather. Offer feed during the cooler morning and evening hours. Ensure unlimited access to cool, clean water. Wetting pigs or providing mud wallows helps them thermoregulate. Electrolyte supplements may be beneficial during extreme heat.

Fall: Traditionally the prime finishing season when pigs are brought to market weight. Acorns, fallen apples, and other autumn forage can supplement the diet. As temperatures cool, appetites rebound. This is a good time to assess body condition and adjust feed for breeding stock heading into winter.