When a person first considers bringing pigs onto their farm enterprise, the most fun decision is “What Breed” of hog to raise. There are the conventional breeds: Yorkshire, Hampshire, Landrace, etc. Many small farmers opt to go with Heritage breed hogs (Berkshire, Glouchester Old Spot, Tamworth, etc.). These are very fine breeds that did not fit well in confinement, so their numbers have dwindled – some nearly to extinction. Small farmers are bringing many of these formally recognized breeds back into favor via niche marketing and conservation efforts through breed registries.
Every breed of hog has been developed by years, decades, even centuries of selective breeding. Pigs displaying desired traits were the ones retained for breeding, but those traits were based on the needs of the farmers in a given area. There have been many breed lines of pigs developed by farmers that have not merited a breed registry. Though the pigs may be very distinctive, their uses may be so specific to the region where they were developed that the pig was of little value elsewhere. What I call the Southern Cross is one of the most distinctive regional breeds.