RESIDUE OF CYPERMETHRIN AND ITS MAJOR ACID METABOLITES IN MILK AND TISSUES FROM DAIRY BOVINES TREATED WITH CYPERMETHRIN

A bovine feeding study was conducted to determine the magnitude of the residues of cypermethrin and its acid metabolites in milk, cream, kid ney, liver, pectoral muscle, adductor muscle, peritoneal fat, and subc utaneous fat following daily oral administration of cypermethrin for 2 8 consecutive days. The dose levels were 5, 15, and 50 ppm (mg/kg) in the diet, which were equivalent to 1, 3, and 10 times the expected max imum intake level in animal feeds. In addition, two registered insect repellent eartags containing cypermethrin were fixed to each animal to establish the maximum conditions of exposure. The residue results wer e used to determine the extent of residue transfer from animal feeds i nto bovine milk, meat products, and meat byproducts. The residue decli ne rate was also measured during a recovery period following withdrawa l of the test substance.