Abstract
In a series of 3 trials, Gardona® (2-chloro-1-(2,4,5-tri-chlorophenyl) vinyl dimethyl phosphate) fed to lactating dairy cows at levels of 22, 37, and 48 ppm of the air-dryration killed 94% or more larvae of the house fly, Musca domestica L., seeded onto the feces. No Gardona (<0.001 ppm) appeared in the milk of cows in the 1st two trials, but several milk samples from cows in the 3rd trial con tained Gardona residues up to 0.005 ppm, which is be lieved to be due to contamination. In a separate experiment an average of 0.3% of Gar dona fed to cows appeared in the feces.
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