Abstract
Insecticides in polyvinyl chloride pellets were included in a commercial dairy protein supplement and fed to dairy cows at 1.4, 2.0, and 2.5 mg of diazinon/kg; 1.3, 1.8, and 2.6 mg of dichlorvos/kg; and 1.3, 2.2, and 2.6 mg of dimetilan/kg body weight for 2 weeks. No insecticidal residues were found in milk samples collected at 1, 3, 7, 10, or 14 days. A 2.5 mg/kg dosage would provide a 5 × margin of safety for PVC-dichlorvos or PVC-diazinon fed to cattle to control face fly, Musca autumnalis De Geer, larvae in manure.
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