Residues of Endosulfan in Meat and Milk of Cattle Fed Treated Forages12

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Abstract
When endosulfan was applied at rates of 4, 8, and 16 oz/acre to forage crops, residues persisted through 71 days on grazed pastures of Coastal Bermudagrass. Fat of beef animals grazed 31–36 days on the treated pastures, beginning 7 days after treatment, were free of detectable residues. Endosulfan persisted in grass silage through 78 days. An unknown product of endosulfan which increased with time was found in silage and was later identified as endosulfan sulfate. Milk from dairy cows fed silage averaging 0.41, 0.70 and 2.35 ppm endosulfan for 21 days was free of detectable residues. Two beef animals ingesting endosulfan at the rate of 5.0 and 2.5 mg per kg per day showed symptoms of toxicity after 2 and 13 days, respectively. Detectable residues were found in fat from animals ingesting endosulfan at the rate of 1.10 mg per kg per day, but there were no signs of toxicity to the animals.

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