[Perspectives of organ, and meat examination in slaughtered animals with reference to the content of antibiotics].

The possibilities of utilizing the optimum conditions for revealing growth inhibiting substances in the carcasses of slaughtered animals were studied. A "direct" method (Kucera, 1969, 1970; Forschner, 1962) was used and operationally simple and usable methods of its application were searched for. The strains of Bacilus subtilis 9/59, Staphylococcus pyogenes aureus ATCC 6538, Bacilus cereus 4/58 were used for that diffusion method; the effect of sample size, duration of pre- diffusion, thickness and quality of agar, density and types of strains on the quality of zone were studied in renal and muscular tissue. The sample size did not affect, in a decisive manner, the quality of zone. On the other hand, the use of 18 hours old bouillon culture of the tester strain applied on agar with a swab was more advantageous than a swab smear from the plate culture. The duration of pre- diffusion and the application of ca. 1.4 mm thick agar had a significantly positive influence. Out of the three strains, Bacilus cereus proved the best catcher, Bacilus subtilis and Staphylococcus pyogenes aureus were less effective.