Here is a list of 30 common pig breeds used worldwide in commercial farming, homesteading, and niche production.

Top 8 Major Commercial Breeds (North America)

These are the most prevalent breeds in large-scale agriculture, often referred to as the "purebred" foundation of the pork industry. 

1. Yorkshire (Large White): The most recorded breed in North America; all-white with erect ears, known as the "Mother Breed" for its large litters.

2. Duroc: Red-colored with drooping ears; prized for fast growth, hardiness, and high-quality marbled meat.

3. Hampshire: Black with a distinctive white "belt" across the shoulders; known for lean muscle and carcass quality.

4. Berkshire: Black with six white points; considered the "Kobe beef" of pork due to superior marbling.

5. Landrace: White with large, heavy drooping ears; highly valued for maternal instincts and bacon production.

6. Chester White: All-white with medium-sized drooping ears; known for durability and mothering ability.

7. Poland China: Black with white points and drooping ears; recognized for large frames and efficient weight gain.

8. Spotted (Spot): Black and white spotted with drooping ears; known for high feed efficiency and fast growth. 

Popular Heritage & Pasture Breeds

These breeds are common on homesteads and small-scale farms due to their foraging abilities and unique flavor profiles.
9. Tamworth: A lean "bacon-type" hog with a reddish-gold coat; excellent foragers.
10. Kunekune: Small, docile grazing pigs from New Zealand; ideal for small homesteads because they don't root excessively.
11. Mangalitsa (Mangalica): Hungarian "sheep-pig" with a curly coat; known for extremely high fat/lard content.
12. Gloucestershire Old Spots: White with black spots; traditionally known as "orchard pigs" for their docility.
13. Large Black: Entirely black with large lop ears; extremely hardy and well-suited for outdoor pasture raising.
14. American Guinea Hog: A small, black heritage breed popular on small farms for its manageable size.
15. Red Wattle: Reddish with fleshy "wattles" on the neck; prized for its rich, beef-like meat texture.
16. Hereford: Red and white markings similar to Hereford cattle; gentle and easy to tame.
17. Mulefoot: A rare breed notable for having a single, solid hoof rather than a cloven one.
18. Ossabaw Island Hog: A small, feral-descended breed that stores fat uniquely; very hardy in harsh conditions. 

International & Specialist Breeds

Commonly raised in Europe, Asia, or for specific research and niche markets.
19. Pietrain: A Belgian breed with high lean-to-fat ratios, though often crossbred due to stress susceptibility.
20. Meishan: A Chinese breed famous for extreme fertility, often producing 15-17 piglets per litter.
21. British Saddleback: Black with a white saddle; common in the UK for high-quality outdoor-raised pork.
22. Iberian Pig: Famous in Spain and Portugal for producing "Pata Negra" ham.
23. Vietnamese Pot-bellied: Widely known as a pet but also used for small-scale meat production in Asia.
24. Göttingen Minipig: The smallest domestic breed, commonly used in medical research.
25. Oxford Sandy and Black: A traditional English breed known for its gentle nature and high-quality meat.
26. Middle White: An English breed once very popular for pork; smaller than the Large White.
27. British Lop: A rare, all-white British breed with large drooping ears.
28. Welsh: A white, long-bodied bacon-type pig common in the UK.
29. Bentheim Black Pied: A German breed recognized for its white coat with large black spots.
30. Angeln Saddleback: A hardy German breed used primarily for outdoor grazing systems.