EN
A total number of 208 samples of mixed feeds for poultry, swine, cattle and sheep, and 36 samples of concentrates were received in 1991 from feed mills located over the territory of Poland. In collected samples concentrations of aflatoxins B₁, B₂, G₁, G₂, ochratoxins A and B, sterigmatocystin and zearalenone were analysed. The presence of ochratoxin A (OA) was confirmed in above 9% of the mixed feeds in the range of 2.5—120 µg/kg. The lowest percentage of samples contaminated with mycotoxins was found in poultry mixed feeds and the highest one in swine mixed feeds. Neither presence of aflatoxins, nor sterigmatocystin or zearalenone was detected in the samples of mixed feeds. Whereas in concentrates aflatoxin B₁ and ochratoxin A were found in 5.5% of samples (mean 40 µg/kg) and 13,8% of samples (mean 198 µg/kg) respectively. Zearalenon was detected only in the one sample of examined concentrates in concentration 1600 µg/kg.