Contamination with microscopic fungi was studied in broiler complete feed mixtures in 1983-1984. The contamination levels ranged from 10(1) to 10(5) of fungus units per gram of feed (mostly around 10(3) units per gram). Sixty species of microscopic fungi of sixteen genera were isolated from the feeds. The genera Aspergillus and Penicillium occurred most frequently (97% of samples), followed by Mucor (93%), Cladosporium (79%), Rhizopus (52%) and Fusarium (41%). Of the 64 isolates of ten species of microscopic fungi, 42 (66%) were toxicogenic, and out of 49 such strains, 27 (55%) were toxic.
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