Methoxychlor In Milk of Dairy Cows Dusted with the Wettable Powder 1

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Abstract
Methoxychlor in amounts of less than 0.1 ppm was found in the milk of herds dusted for horn fly (Haematobia irritans (L.)) control with approximately 10 g per cow of 50% methoxychlor wettable powder. The contamination was presumably of extraneous origin rather than by excretion in the milk. Under practical conditions, herds are dusted at approximately 3-weeks intervals so extraneous contamination would be expected to occur simultaneously on only a few farms in an area. Upon dilution with other milk from the area, the slight contamination occurring on individual farms at any given time should result in methoxychlor residues of less than 0.01 ppm in commercial milk.

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