Tainted feed used to feed dairy cows led to high levels of a cancer-causing toxin at two of China’s dairies, including its largest dairy.

The Associated Press reports a government safety agency found mildewed feed created high levels of aflatoxin in milk from Mengniu Dairy Group and the Fujian Changfu Dairy Industry Group. Aflatoxin is produced by a fungus that can be found on legume crops including peanuts, soybeans, corn and wheat.

High doses of aflatoxin are linked to cancer, primarily in the liver.

The tainted milk was destroyed and the milk will be safe again when the tainted feed is out of the cows’ system.

The dairy industry has seen fast growth, but quality issues have been a consistent burden.

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Source: The Associated Press