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Insecticide Residues in the Milk of Dairy Cows Treated for Control of Ectoparasites^1,2,

Division of Crop Production and Protection, Department of Biology and Division of Animal Production and Protection, American University of Beirut, Beirut, Lebanon

ABSTRACT

BHC (1,2,3,4,5,6-Hexachlorocyclohexane), chlordane (2,3,4,5,6,7,8,8-Octachloro-2,3,3a,4,7,7a-hexahydro-4,7-methanoindene), and ronnel [0,0-Dimethyl-0-(2,4,5-trichlorophenyl) phosphorothioate] residues were determined quantitatively in milk samples obtained from 21 Holstein-Friesian cows at regular intervals for 22 days following treatment.

Three weeks after application, 0.006 and 0.016 parts per million of BHC were found in whole milk of cows sprayed with 0.03 and 0.06% BHC, respectively. Similarly, the utilization of 0.25 and 0.5% chlordane resulted in residues of 0.232 and 0.319 parts per million, respectively. Application of 0.38 and 0.75% ronnel resulted in undetectable levels four days after application. All reported concentrations of insecticides were on whole milk basis.

¹ Authorized for publication on September 21, 1967, as Journal no. 209 of the Faculty of Agricultural Sciences of the American University of Beirut.

² Presented at the Sixth International Congress of Plant Protection, Vienna, Austria, August 30–September 6, 1967.

³ Present address: Macdonald College, McGill University, Montreal, Quebec, Canada.