and they are also suspected to be a causeof esophageal tumors in certain human populations [36,6].Regulatory authorities have established guidance levels forFBs (total including FB1, FB2and FB3) in animal feed. Theseguidance values, concerning complementary and completefeeding stuffs, are 5 mg kg−1for horses, rabbit, pigs and petanimals, 10 mg kg−1for fish, 20 mg kg−1for poultry, calves(4 months) and mink [16].