Milk is tested at the dairy plant. If it is found to have aflatoxin concentration greater than 0.5 ppb, it is discarded immediately and is not processed. The producer who has the contamination problem is notified; often the rejected milk is returned to the farm for proper disposal. Ration dry matter concentration of less than 20 ppb aflatoxin B1 should result in a milk concentration of less than 0.5 ppb. The producer should immediately test feeds for contamination, starting with corn, cottonseed, and corn silage (most common sources of aflatotoxin). Other feed sources also may be tested. It is important to keep detailed feeding records. Removing the contaminated feed source should allow the milk to be free from aflatoxin in approximately 92 hours.

Dave Fischer, Extension Dairy Educator, University of Illinois - Illini DairyNET