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Eight dairy cows were fed alfalfa hay treated with either heptachlor or dieldrin and feeding trials were conducted for 112 days, during which milk samples were taken weekly. A small amount of dieldrin was found in the milk and a considerable amount in the butter from cows fed hay treated with 1 and 4 ounces of dieldrin per acre. No heptachlor was excreted in the milk. Heptachlor epoxide was found in milk and butter from cows fed hay treated with 4 ounces of heptachlor per acre. There was no detectable effect on milk production, feed consumption, or health of cows. Histological examination of kidney, liver, muscle, and fat tissue showed no abnormalities associated with insecticide treatment.

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