Fate of P32-Labeled Malathion Sprayed on Jersey Heifer Calves1

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Abstract
A study has been made of the fate of p32-labeled malathion and metabolites in 2 Jersey heifer calves after 2 spray applications each (2 weeks apart) of 1 pt. 0.5% P32-malathion water emulsions. The malathion was rapidly absorbed and metabolized and was eliminated in the urine, principally as water-soluble metabolites and degradation products (96 to 99%). The 2 calves were sacrificed 1 and 2 weeks after the 2nd spray application, and residues in 10 cuts of meat and in tongue, brain, spinal cord, thymus, thyroid, pancreas, kidney, liver, heart, rumen, suet, bone, marrow, and hide were detd. radiometrically. Residues in all tissues except the hide were in the form of water-soluble metabolites and degradation products, no unchanged malathion or chloroform-soluble metabolites being found. Chemical analyses for malathion in tissues of the foreleg, hind leg, and rump of the heifers showed no detectable malathion.

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