In this study, the concentrations of AFM1 detected in raw milk samples may indicate that food provided to cows in dairy farms in Minas Gerais was probably contaminated with the toxin, especially during the dry period, when rainfall did not exceeded 8.0 mm and temperatures were moderate (Table 1), and supplementary feedstuff was provided to feedlot cattle. Also, higher levels of contamination were detected in the transition period, when the rainfall rates increased at moderate temperatures, representing a climate period in which the cattle are usually kept in confinement and on pasture land. However, in the rainy period, when the animals are usually free to roam on pasture land, the risk of contamination decreased, with lower concentrations of AFM1 detected.