Residues in Beef Fat Following Heptachlor Feeding1

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Abstract
Heptachlor fed in the total diet of cattle in amounts beginning at 5 parts per million and decreasing to zero in 6 weeks did not produce detectable residues of heptachlor or of its epoxide in the fat of the cattle. Continuous feeding for 16 weeks of levels varying from 1 to 60 p.p.m. indicated that below 3.75 p.p.m. heptachlor and its epoxide would not be stored in beef fat. A diet containing 30 p.p.m. for 16 weeks resulted in residues of epoxide in fat only. At 60 p.p.m., small amounts of epoxide (less than 2 p.p.m.) were found in liver and thymus as well as higher residues in fat. Heptachlor was not detected in any of the samples at any of the levels fed.

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