[The effect of growth stimulators on the levels of various trace elements in chickens].

Chickens, fattened for 56 days, were treated with nitrovin at the dose of 15 mg per kg of feed, cyadox at the dose of 20 mg per kg of feed, and virginiamycin at the dose of 10 mg per kg of feed. After the fattening, the chickens were studied for the contents of copper, zinc, and manganese in the blood serum, thigh muscle, breast muscle, and feathers. The contents of copper, zinc and manganese in the serum ranged within the limits of physiological values. As for the breast muscle, the content of copper increased but the content of manganese declined in both breast and thigh muscle, as compared with the control group. The feathers contained more manganese in all the groups, as compared with the controls.