ABSTRACT. The purpose of our study was to study the effect of promising calcium sources on the level of toxic elements in bone tissue. The use of calcium chloride at a dosage of 10% led to an increase in the content of a number of toxic elements (Cd, Al and Pb) in the femur, while the addition of dolomite flour to the diet at the same concentration contributed to a decrease in the amount of manganese, copper and calcium in bone tissue in comparison with control.
KEYWORDS: calcium, lead, toxicity, rats.