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A total of 5049 samples of milk taken from small containers and 39 samples of collected milk obtained from purchasing centres were tested for the presence of inhibitory substances. It was found that 15.71 per cent of can milk and 33.33 per cent of collected milk contained those substances: beta-lactum antibiotics at the rate of 0.008—0.017 IU per ml were found in 10.38 per cent of can milk and 20.51 per cent in collected milk. Five of 40 milk stations possessed milk free from beta-lactum antibiotics and only two from inhibitory substances. Such a high per cent of milk contaminated with beta-lactum antibiotics suggest that those preparations has been administered for treatment of udders by farmers without any control of veterinary service.
Residues of antibiotics in food of animal origin may pose health hazards to consumers. For this reason, their presence must be systematically controlled. One aspect of the official control is a national programme for the control of banned substances and of chemical, biological and medical product residues in animals and in food of animal origin, developed and implemented in accordance with Council Directive 96/23/EC. The aim of this study was to present the results of investigations of antibiotic residues carried out as part of this programme in 2005-2010. Samples were taken by veterinary inspectors. Analyses of antibacterial substances were performed using microbiological screening methods (4-plate method and Delvotest SP-NT). Positive results were confirmed by the chromatography technique. Furthermore, some of the selected antibiotics were detected by instrumental methods. During the period under analysis, the residues of antibacterial substances were detected in 0.32% of samples tested. The residues of sulphonamides were identified in 25 samples of honey, whereas tetracyclines in two samples of poultry. No residues of quinolones, streptomycin, penicillins and florfenicol were detected. The presence of banned substances was detected in 9 samples: nitrofurans in 2 samples, and chloramphenicol in 7.
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