Investigations on the mycological quality of feeds from Transylvanian farms are presented. The investigations had two objectives: 1. survey for mycological contamination and related chemical composition; 2. the evaluation of effects ofFusarium graminearum Schw. infested wheat (8% in the diet) on productivity and digestibility of nutrients in broilers. More than 50% of the samples showed water contents exceeding 16%, due to inadequate harvesting and storage conditions. This correlated with high my-cological contamination, with dominant species of the genusFusarium, Aspergillus, Alternaria,Penicillium andRhizopus. Feeding trials with broilers showed that live weight gain and digestibility coefficients of protein and fat in animals givenFusarium infested grain were depressed. As well N-retention and feed conversion rate (kg feeding stuff/ kg weight gain) were impaired.