Zearalenone /F=2 toxin/ is a mycotoxin produced by Fusarium Roseum,F.Graminearam moulds and some other species of the Fusarium genus. Zearalenone has a pronounced estrogenic effect on fare animals, especially on pigs and causes infertility. In high concentrations it produces teratogenic effect. No convincing data on unfavorable effect of zearalenone on men are presently available.