[Effect of vitamin D on lead assimilation].

It was established in experiments on rickety chickens given and not given an additive of 0.5% lead acetate to the diet and vitamin D3 (10 IU/day intramuscularly) for a week that vitamin D induced an appreciable increase of lead deposition in the tissues. The degree of lead poisoning assessed according to the content of delta-aminolevulinic acid in red cells was 8 times as increased as compared with the same indicator in chickens not injected with vitamin D.

[Relations between the supply of vitamin D and accumulation of Pb in chickens].

Lead accumulation in the body of 25-day-old chickens was studied depending on the dose of lead and the presence of vitamin D in the diet. It was found that with the increase of the dose of lead (40, 100 and 200 mg/kg feed), its level in the blood, bones, kidneys and liver grows. Introduction of vitamin D in the diet (500 IU per kg) considerably raises the content of lead in the blood (from 212 to 284 micrograms/100 ml) in bone tissues (from 29.