The American Yorkshire pig is a breed of domestic pig. It is the American version of the Yorkshire pig (now usually known as the English Large White pig), white in color, with erect ears, and the most recorded swine breed in the United States.
The Yorkshire breed was developed in Yorkshire, England, circa 1761. In 1830 the first Yorkshires were imported to the United States, specifically to Ohio, but because of their slow growth rate they did not become popular until the late 1940s. At that time, many large Yorkshires were imported from Canada and England for their ruggedness and favored carcass. The breed then improved rapidly through selection.
Today Yorkshire pigs are found in nearly every American state, with highest populations in Illinois, Indiana, Iowa, Nebraska, andOhio. The modern Yorkshire is muscular with a high proportion of lean meat. Yorkshire data records have been maintained with great diligence, including growth, sow productivity, and backfat formation, representing the largest source of documented livestock performance records in the world.
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