THE PRESENCE OF HARMFUL CHEMICAL-ELEMENTS (HG, CD, PB) IN THE STABLE ENVIRONMENT FOR PIG HERDS

The presence of harmful chemical elements (Hg, Cd, Pb) in the stable e nvironment for fattened pigs was compared in Hodonin district in the y ears 1984 and 1994. These data were recorded for the year 1994 in comp arison with 1984: 1. mercury content in feed mixtures for pigs decreas ed 102 times (0.510 and/or 0.005 mg/kg), cadmium content 8 times (0.40 0 and/or 0.048 mg/kg) and lead content 6 times (2.680 and/or 0.420 mg/ kg); 2. mercury content in stable dust deposition decreased 27 times ( 0.480 and/or 0.018 mg/kg) and cadmium content 6 times (1.370 and/or 0. 248 mg/kg), but lead content slightly increased (5.980 and/or 8.569 mg /kg); 3. mercury content in the bristles dropped 20 times (0.440 and/o r 0.022 mg/kg), cadmium content 5 times (0.080 and/or 0.015 mg/kg) and lead content 10 times (1.690 and/or 0.195 mg/kg). In addition, the pr esence of Hg, Cd and Pb in pig manure and road dust was investigated. Road dust exhibited an increased lead concentration (22.800 mg/kg), so it is not possible to exclude lead penetration from the stable surrou ndings to the internal environment of the stable. After application to arable land, pig manure can be a vector of some amounts of heavy meta ls (Hg 0.003; Cd 0.024; Pb 0.518 mg/kg dry matter). It is a positive r esult that there has been a significant decrease in mercury and cadmiu m contents in the stable environment for fattened pigs in the last dec ade. This fact reduces the health risk not only for pigs but also for their tenders.