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Results of Feeding Methoxychlor Sprayed Forage and Crystalline Methoxychlor to Dairy Cows

Bureau of Dairy Industry

P. E. Hubanks, E. H. Carter and F. W. Poos

Bureau of Entomology and Plant Quarantine, U. S. Department of Agriculture

ABSTRACT

Available data on the excretion of the methoxy analog of DDT [1, 1, 1 - tri--chloro - 2, 2 bis (p-methoxyphenyl) ethane] in the milk of dairy cows is extremely limited. An increase in the use of methoxychlor on forage crops intended for dairy cattle feeding makes it desirable to study the residues of methoxychlor on forages of after treatment with various formulations and to ascertain the extent of methoxychlor excretion in the milk of animals fed these forages.

Biddulph et al. (3) dusted alfalfa hay with 1, 2, and 2.8 lb. of methoxychlor per acre and harvested forage having 7, 9.5, and 14 p.p.m., respectively, of methoxychlor residue on the hay. Methoxychlor was not detected in the blood, milk, or selected tissues of the cows fed these hays. These data indicate that methoxychlor is not excreted in the milk at levels of feeding which would result in the excretion of DDT in the milk when feeding comparable DDT intakes (1, 2, 5, 6, 9, 10, 11, 13, 16, 17, 19, 21).

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