A total of 1503 of commercially mixed feeds, cereal grains, milk replacers, protein concentrates and processed animal feeds were collected during the years 1991-1994 from commercial mills and animal feeding stores located throughout Egypt. Aflatoxins were detected in 619 (41%) samples. The presence of aflatoxins in the range of 1-2000 ppb was evidenced in the positively tested samples. The commercially mixed feeds were found to be more contaminated with aflatoxins than were in the cereal grains. Poultry rations showed the highest % of aflatoxins (55%) among the total tested (362) samples. On the other hand milk replacer proved to have the lowest aflatoxins contamination (7%). These results may explain the recent increase of some diseases as hepatocellular carcinoma and nephropathy among animals and humans in Egypt.