Mycotoxins are secondary metabolites produced by several fungal species, toxic to humans, animals and plants. Their ingestion, inhalation or dermal absorption may cause different diseases and even death. These compounds have been described for many decades, however in the beginning of the s, they have been chemically characterized due to the discovery of aflatoxins [ ]. The word aflatoxin is the combination of other words a for Aspergillus genus, fla for the species flavus and toxin, meaning poison [ ]."flatoxin is the mycotoxin generating the greatest losses and the highest management costs due to its extremely high toxicity on a unit basis, and its long history of stringent regulation. The costs are inversely related to the regulatory level that must be met, and lower concentration allowances will increase the costs of crop management. Several effective ways for the management of mycotoxin contamination in agriculture have been stressed. One strategy to manage mycotoxin contamination and decrease health risks and economic costs is to instruct food producers and handlers on how to minimize mycotoxin contamination, and to encourage the adoption of process-based guidelines such as Good "gricultural Practices G"Ps before harvest and good manufacturing practices GMPs after harvest. These actions would minimize risk throughout the production, handling, and processing chain, and can complement product standards [ ]. To control the presence of aflatoxins in foods, many countries established maximum tolerated concentrations through legislation Van Egmond, a cited [ ] .This chapter focuses on properties of aflatoxins and their occurrence in feeds and animal products as meat, eggs, liver, kidneys and milk. Topics regarding mycotoxins absorbents and legislation in feed ingredients and feeds are also covered.