New York State Board of agriculture and markets 23 that killed at least have found 16 dead cats and dogs and forced pet food manufacturing company in North America, a large number of recalled products, the chief culprit - ammonia neopterin. In many countries, such toxic substances used in the manufacture of anti-rodent medicine.

 U.S. officials in the 23 press conference did not say how this substance into the pet food, but the American Broadcasting Corporation (ABC) reported that the investigating officers in the "food menu" (Menu Foods) Pet Food Company of the raw materials used in the A - found in wheat neopterin ammonia, these wheat imports from China.

 Cornell University College of Veterinary Medicine Dean Donald. Smith said at a news conference, toxic substances identified as ammonia neopterin, the researchers tested the cat food, the content of this material for more than 40 millionths. Neopterin large doses of ammonia are highly toxic, the substance in the United States only used in the manufacture of anti-cancer drugs.

 "Food menu" (Menu Foods) Pet Food Company announced on the 16th in the United States, Canada and Mexico's recall of 48 brands of dog food and 40 brands of cat food, other pet food manufacturers to take the same action then. (Beijing Evening News)