The presence and/or accumulation of mycotoxins in foods intended for human and animal nutrition is a constant concern for the harmful health effects resulting from ingestion. The aims of this communication were to analyze samples of feed and raw materials for manufacturing and to determine the presence of strains of filamentous fungi with toxigenic capacity. The values of frequency in the total samples (N = 422), indicated 63% of contamination, where A. flavus represented the most common (29.8%), while in feed and raw materials separately, indicated A. flavus has the highest value in both categories. In the analysis of different type of raw materials, A. flavus contaminated all types of samples, with the bran and soybean meal substrates having higher values for this Aspergillus, and corn substrate more fungal contamination. These results would demonstrate that the presence of mycobiota with toxigenic potential in food for animal feed is a disturbing reality.