Feet, heads, hearts, tongues, kidneys, stomachs, entrails - parts of a pig that most Americans would shun are considered special in China. "US pork meat and variety meat exports to China have fallen to zero. Moreover, the grey market through Hong Kong is also closed," Hayes told China Daily. The loss of the Chinese market for US-produced variety meats also hurts major processors, including Virginia-based Smithfield Foods Inc, the nation's largest pork producer. American pig farmers are looking at other markets like Japan, South Korea, the Philippines for variety meats, as well as US pet food makers.