SECAUCUS, N.J., Jan. 25, 2013 /PRNewswire/ -- The Hartz Mountain Corporation is voluntarily withdrawing its Hartz ® Chicken Chews™ and Hartz ® Oinkies® Pig Skin Twists wrapped with Chicken for dogs in the United States because they contain trace amounts of unapproved antibiotic residue. We are taking this action after recent Hartz testing found trace amounts of unapproved antibiotic residue in samples of Hartz® Chicken Chews™ and Oinkies® Pig Skin Twists wrapped with Chicken products. Even though two-thirds of the products we tested did not contain antibiotic residues, we would rather be overly cautious by voluntarily withdrawing these products from the market. These antibiotics are approved for use in poultry in China and other countries, including European Union member states, but are not among those approved in the U.S. Based on the FDA's review of the New York State Department of Agriculture & Markets (NYSDAM) results, there is no evidence that raises health concerns, and these results are highly unlikely to be related to the reports of illnesses FDA has received related to jerky pet treats. Immediately upon learning of this finding, Hartz contacted the FDA to share our test results and execute a nationwide voluntary withdrawal. There have been no known illnesses to date associated with the consumption of these products. "Upon learning about the nationwide voluntary withdrawal of several other brands of chicken jerky products through media reports, Hartz acted immediately to begin additional testing to determine if the same unapproved antibiotic residues were present in our products," said Sean McNear, Sr. Director of Quality and Regulatory at Hartz Mountain. There is no indication that the trace amounts of unapproved antibiotic residue are linked to the FDA's ongoing investigation of chicken jerky products produced in China. The trace amounts of antibiotic residue do not pose a health or pet safety risk. No other Hartz products are affected by this withdrawal.