Pure Berkshire Pork 100% is pork that has been certified by the American Berkshire Association. Berkshire refers to a specific breed of hog.  For over 300 years, the Berkshire hogs have been recognized as producing the supreme quality gourmet pork.   In Japan, the supreme quality gourmet pork is known as "Kurobuta" or "black pig."

Source: americanberkshire.com