Beijing ? China has suspended imports of chicken feet, pig ears and other animal products from seven U.S. companies, including the world’s largest meat processor, in an apparent attempt to turn the tables on American complaints about tainted products from China.

The American meat had contaminants including salmonella, feed additives and veterinary drugs, according to a list posted on the Web site of China’s General Administration of Quality Supervision, Inspection and Quarantine late Friday.

The U.S. and other countries have cracked down on Chinese products since the U.S. Food and Drug Administration found in April that North American dogs and cats were poisoned by tainted Chinese pet food ingredients. Since then, a growing number of Chinese products have been found to be tainted with potentially toxic chemicals and other adulterants.

Frozen pork ribs from Wichita, Kan.-based Cargill Meat Solutions Corp. contained the leanness-enhancing feed additive ractopamine, the agency said. Frozen pig ears from Kansas City, Mo.-based Van Luin Foods USA, Inc. were found to contain ractopamine. Frozen chicken feet from Atlanta-based Intervision Foods was tainted with salmonella, and frozen pork from Atlanta’s AJC International, Inc. was tainted with ractopamine, the agency said.

Both stewed chicken feet and pig ears are popular dishes in China.