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Secretion of Heptachlor Epoxide in the Milk of Cows Fed Field-Cured Hay from Soils Treated with Heptachlor

Departments of Dairy Science and Entomology, Virginia Agricultural Experiment Station, Blacksburg

ABSTRACT

Alfalfa hays containing high, medium, and low residues of heptachlor and heptachlor epoxide were fed to dairy cows for a period of 30 days. Residue determinations were made on milk samples prior to feeding the contaminated hay, and at intervals during the treatment and post-treatment periods. The residues on the hay resulted from treating the alfalfa in the early spring with heptachlor either in granulated form or mixed with fertilizer.

Heptachlor epoxide was detected in the milk of cows fed on hay containing significant residues. The residues in the milk rose rapidly during the first ten days of feeding, and changed very little during the remainder of the 30-day feeding period. The magnitude of residues in the milk was generally proportional to that in the hay.

Residues in the milk returned to pretreatment levels at 15, 30, and 45 days after treatment stopped in the low, medium, and high treatment groups, respectively.

The consumption of the insecticide at the levels employed in this study had no apparent effect on milk production, weight, or general health of the animals.