Aldrin, dieldrin, heptachlor, DDT, and methoxychlor were fed in the daily rations to dairy cows for 1 6 weeks. For varying periods afterwards, the cows were fed on insecticidefree rations. Milk samples were analyzed through both periods to determine the rate of accumulation and decline. The rates of accumulation for the various insecticides were as follows: cildrin (excreted as dieldrin) > dieldrin > DDT > heptachlor (excreted as heptachlor epoxide) > methoxychlor. CERTAIN CHLORINATED HYDROCARBON insecticides are excreted in milk at different rates per unit of intake. Many studies have contributed to the determination of their relative safety in actual usage.
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