Dieldrin and heptachlor epoxide residues in fat from hogs foraging on corn stover in insecticidally treated fields.

Abstract

Hogs pasturing on corn stover in insecticidally treated fields accumulated measurable residues of dieldrin and heptachlor epoxide. Hogs weighing between 40 and 60 pounds were placed on these treated fields for varying periods of time. Residues of heptachlor epoxide and dieldrin accumulated in the fat to levels of from 0.032 to 0.071 ppm. of heptachlor epoxide and from 0.080 to 0.141 ppm. of dieldrin. Removal of the animals to concrete slabs for further fattening for varying periods of time reduced but did not eliminate these residues.