Chlorpyrifos and 3,5,6-Trichloro-2-pyridinol: Residues in the Body Tissues of Cattle Wearing Chlorpyrifos-Impregnated Plastic Ear Bands

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Residues of the insecticide chlorpyrifos and its metabolite 3,5,6-trichloto-2-pyridinol (pyridinol) were determined in the body tissues of Hereford yearlings at intervals after they had a 10% chlorpyrifos-impregnated plastic band attached to each ear. Each band contained ca. 3.3 g of chlorpyrifos; therefore, each animal was initially exposed to ca. 6.6 g of chlorpyrifos. Residues of chlorpyrifos were found in fatty tissues only (maximum 0.091 ppm at 2 wk biopsy) with the exception of the muscle of one animal at 5-wk posttreatment slaughter that contained a residue of 0.010 ppm. Residues of pyridinol were found only in fat, liver, and kidney tissues (max 0.037 ppm in kidney at 5-wk posttreatment slaughter) and 2 heart samples each containing pyridinol residues of 0.01 ppm. Attachment of the bands to the ears resulted in moderate to severe necrosis in one or both ears of each animal.

Document Type: Research Article

Publication date: August 1, 1978

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