This in the New York Times ...

April 30, 2007
Filler in Animal Feed Is Open Secret in China
By DAVID BARBOZA and ALEXEI BARRIONUEVO
ZHANGQIU, China, April 28 — As American food safety regulators head to China to investigate how a chemical made from coal found its way into pet food that killed dogs and cats in the United States, workers in this heavily polluted northern city openly admit that the substance is routinely added to animal feed as a fake protein.

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http://www.nytimes.com/2007/04/30/business/worldbusiness/30food.html?em&ex=1178078400&en=7ad19856687df98a&ei=5087%0A