Excretion of Endrin in the Milk of Cows Fed Endrin-Sprayed Alfalfa and Technical Endrin1

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Abstract
Hay made during 2 seasons from alfalfa sprayed with 2.7, 6.6, and 7.8 oz. of endrin per acre, harvested 1 week after spraying and stored dry in bales for 6 months, had 2.8, 3.7, and 1.9 ppm of endrin, respectively, when fed to dairy cattle. Cows receiving the hay containing endrin residues of 1.9, 2.8, and 3.7 ppm produced milk with 0.05, 0.14, and 0.15 ppm of endrin, respectively. These results indicate that daily endrin intakes of greater than 20 mg as a residue on sprayed forage are necessary for excretion of measurable amounts of endrin in the milk. When feeding endrin dissolved in soybean oil to milking cows higher intakes were required to detect endrin in the milk than when feeding endrin residues on alfalfa hay. Toxic symptoms were noted in 2 cows receiving in excess of 1.5 mg of endrin in soybean oil/kg of body weight. Relatively low concentrations of endrin are excreted in the milk fat when toxicity symptoms appear in the animal.

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