Fifty isolates of Aspergillus flavus as well as 25 isolates of each of
A. fumigatus, A. ochraceus, A. terreus and Fusarium spp. isolated fro
m poultry feeds were screened for toxin production. Of these isolates,
20% have been detected to exhibit toxigenic activity. The mycotoxin c
ontent was determined in samples of grind maize, cotton-seed cake, fis
h meal, wheat bran and soybean meal. 80% of maize samples were highly
contaminated with aflatoxins (480 mug/kg) and zearalenone (40 mug/kg).
Aflatoxins B1 and B2 were found in 50 and 30% of cotton-seed cake and
fish meal, respectively. With wheat bran, 40% of the samples containe
d aflatoxin B1 and zearalenone. Soybean meal appeared to be a poor sub
strate for mycotoxin formation.