Dermal and Oral Treatments of Cattle with Phosphorus-32-Labeled Co-Ral Only small amounts of phosphorus-32 were absorbed through the skin and eliminated in the urine following dermal application of the compound to cattle. High levels of the unchanged toxicant were found on the hair several weeks after treatment. The compound was ineffective as a systemic against stable flies and screwworm larvae but highly effective against these insects by contact. On oral treatments, at 10 and 20 mg. per kg., approximately 38% of the dose was excreted in urine as polar degradation products and about 35% in the feces 7 days after treatment.
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