Effect of Chelation with Calcium Disodium EDTA on Haemato-biochemical and Trace Mineral Profile in Blood from Lead Exposed Calves
An experiment was performed using 20 calves of about one-month old to investigate the effect of chelation therapy with calcium disodium ethylenediaminetetraacetate ( $CaNa_2$ EDTA) alone or along with antioxidant $\alpha$ -tocopherol in lead loaded calves on blood trace minerals, erythrocytic sulfahydryl groups and some haematobiochemical parameters. Fifteen calves were given lead orally at a daily dose of 7.5 mg of 99% pure lead acetate/kg body weight for 28 days. Then the lead was withdrawn on day 28 and the calves were randomly divided into three groups. Each group of five animals was either treated with $CaNa_2$ EDTA alone at the dose rate of 110 mg/kg body weight in two divided doses for 4 days or along with $\alpha$ -tocopherol at the dose rate of 100 mg/kg body weight orally daily for 7 days, keeping the remaining five calves as lead-exposed untreated controls. Blood samples were collected at the end of the lead exposure (day 0) and thereafter on day 2, 4, 7 and 10 from the start of the chelation treatment. The treatment with EDTA alone led to slow but non-significant improvement in blood copper level, but incorporation of antioxidant $\alpha$ -tocopherol in chelation therapy resulted in its significant decline, as recorded on day 7-post treatment. Withdrawal of lead or treatment with $CaNa_2$ EDTA alone or along with $\alpha$ -tocopherol enhanced the erythrocytic thiol contents and the levels of T-SH and P-SH became statistically (p 0.05) change in serum urea, creatinine, total protein and albumin levels between the treatment groups. It is concluded from the present investigation that treatment with $CaNa_2$ EDTA at the present dose rate is safe to be used for chelation in lead loaded calves.
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