Increased pollution by the Fusarium fungi, due to genetic selection of seeds resistant of Aspergillus flavus has been followed by food contamination by toxins. Zearalenone is a toxin with hormonal estrogenic chemical structure and has symptoms in prepubertal and fertile plus abortions in pregnant females. This infection must be differentiated from other toxins of another fungus called Claviceps purpurea. This intoxication is by the substance called ergotamine, also produces reproductive diseases and affects the entire circulatory system and only occurs in relation to the inclusion of rye animal nutrition, while the estrogenic syndrome only affects the reproductive system and may be from any cereal contaminated by Fusarium.