Intake of heavy metals (lead, cadmium, zinc) originating from colored paints and their incorporation into organs and tissues of heifers

In a feeding trial the effect of heavy metals as lead, cadmium and zinc originating from colour paints was investigated. The study included 30 early pregnant heifers subdivided in five groups with six animals each with an average body weight of 419 kgs. During the testing period the trial was carried out in a three factorial fashion with two time sections: section one--mineral supplementation and lead preexposure; section two--Exposure to heavy metal containing colour paint pigments. The investigation led to the following results: A short time uptake of daily 10 g lead containing colour paint (i.e. 22-24 mg Pb/per animal and day) did not cause any change of general health and normal behavior of the respective animals. A storage of lead in the body tissue could be observed by way of a hint. An additional prestress with lead (145-158 mg Pb/animal/day over a period of 84 days did not influence the general health of the animals significantly. Both the fodder uptake and the body weight gain was inconspecious. A storage of lead could be traced in the skeleton, kidney and liver and--on a reduced level--also in the muscle. Only the content of lead in the kidney exceeded the maxmium tolerated value (> 1.0 mg/kg) of the German Meat Hygiene regulation. A mineral deficient feeding regimen (especially lack of calcium) enhance an increased storage of lead in the tissues (skeleton).