Corn with known levels of aflatoxin must be directed toward the appropriate feed use, with documentation to the seller of its condition. Normally, aflatoxin corn cannot be blended for the purpose of diluting the aflatoxin concentration. However, in high incidence years, FDA has generally granted a waiver to allow blending for use in livestock feed, using prescribed blending and testing procedures, and with documentation to accompany the blended grain. Iowa has asked for this waiver in 2012; FDA response is forthcoming. Under no circumstances should corn known to contain more than 20 ppb aflatoxin be offered for sale to the general market where the final use is not known at the time of sale. All U.S. export corn is tested for aflatoxin at the port, before it can be loaded on a vessel. By contract, most U.S. export DDGS and gluten feed/meal is also tested. Corn co-products are particularly sensitive because the aflatoxin is concentrated 3 to 1 from the levels of the source corn. In all cases, the very high potential error generated by any aflatoxin analysis should be considered.
Iowa State University
Hurburgh, Charles R. Jr., "Aflatoxin: Handling Corn" (2012). Integrated Crop Management News. 131.
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