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Feeding DDT and Alfalfa Sprayed with DDT to Calves¹

U. S. D. A., Washington, D. C.

ABSTRACT

DDT in oil solution and alfalfa containing various amounts of DDT residue were fed to 15 dairy calves. The growth of these calves was not adversely affected by the amounts of DDT ingested. Hemoglobin, vitamin A, carotene, calcium and phosphorus concentrations in the blood also were entirely normal. No histologic changes ascribed to DDT ingestion were found in the livers of these calves. DDT intake varied from 0.07 to 2.9 mg. per kg. of body weight or 2.2 to 106 ppm. of the dry matter consumed. The DDT feeding period ranged from 160 to 230 days in length. The storage of DDT in the body and kidney fat varied from 2.0 to 345 ppm. and the concentration in the fat was proportional to the DDT intake. When DDT intake exceeded 10 ppm. of the dry matter intake, DDT appeared in the meat of the calves.

¹ Report of a study made in part with funds available under the Research and Marketing Act of 1946.

² Bureau of Dairy Industry.

³ Bureau of Entomology and Plant Quarantine.

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