EN
One hundred eighty five samples of raw milk from a street sale, 71 samples of bottled pasteurized milk, 104 samples of pasteurized milk from polyethylene bags and 13 samples of cardboard sterilized milk produced by different milk cooperatives in Poland and 43 samples of raw milk from the state farms were investigated for the presence of inhibitory substances including beta lactamate anitibiotics, number of somatic cells and hygienic quality. A very high percentage (71,4%) of milk samples from a street sale contained inhibitory substances and 41,l% of samples were contaminated with beta lactamate antibiotics. The inhibitory substances were found in 21,1—33,3% of market milk confectioned by milk cooperatives, depending on the sort of package, and antibiotics were found in 1,0—4,0% of these samples. Seven percent of milk samples from the state farms contained antibiotics. The highest number of somatic cells was noted in milk from a street sale. The hygienic quality of this milk was the lowest. Antibiotic and inhibitory substances present in drinking milk create a danger for milk consumers. A low hygienic quality of market milks is associated mostly with a low hygienic conditions of milking and unproper healthy state of udders.