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Agricultural Toxicology Laboratory and Department of Animal Husbandry, University of California, Davis
ABSTRACT
Feeding a single large dose (about 14 mg/kg) of 1,1,1-trichloro-2,2-bis(4'-chlorophenyl) ethane (DDT) to dairy cows caused a very large but transient increase in blood and milk levels of the insecticide. After 3 wk, milk fat levels had declined to a near-plateau of about 6 ppm, and the total time required for attainment of a 2.5-ppm level was calculated to be at least 15 wk.
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