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Secretion of Telodrin in the Milk of Cows Fed Varying Levels of Telodrin¹

Virginia Agricultural Experiment Station, Blacksburg

ABSTRACT

Telodrin, a chlorinated hydrocarbon proposed for control of the alfalfa weevil, was fed to lactating dairy cows for 90 days at the rate of 0, 0.02, 0.06, and 0.15 ppm. Milk was sampled periodically during treatment and for 60 days post-treatment, and analyzed for Telodrin content. Tissue fat biopsies were also made.

For the higher levels of Telodrin (0.06 and 0.15 ppm) increases in insecticide content of milk were noted during the entire treatment period. Trace amounts of Telodrin were found at the 0.02 ppm level, which roughly corresponds to that in the treated hay, and none was detected in milk from control cows. Considerable residue was present in milk of cows on the highest treatment level at 60 days posttreatment, but not in other treatments. Fat biopsies taken 88 days after animals were on treatment reflected the level of insecticide in ration.

¹ Partially supported by funds provided by Shell Chemical Co., New York, N. Y.