Excretion of Heptachlor Epoxide in the Milk of Dairy Cows Fed Heptachlor-Sprayed Forage and Technical Heptachlor

No heptachlor or heptachlor epoxide was detected in the milk of cows fed hay made from forage sprayed with 3.8 to 8.0oz. of heptachlor per acre and harvested 7 days after spraying. Heptachlor epoxide was detected in the milk of a cow fed 1.3mg. of heptachlor per kilogram of body weight. Cows fed increasing amounts of heptachlor (up to 3.78mg. per kilogram of body weight) had concentrations of heptachlor epoxide in the FCM as high as 5.7 p.p.m. From 0.3 to 2.8% of the heptachlor fed was excreted in the milk as the epoxide metabolite.