Abstract

Abstract Administration of 2 g carbonyl-14C-carbaryl to a lactating cow resulted in radioactive residues in milk of approximately 1 % of the administered dose. Analysis of the distribution of radioactivity in skim milk showed 13 and 87% of the radioactivity present as organic-soluble and water-soluble components, respectively. Crystallization of lactose from the water-soluble components resulted in removal of 90—95% of the 14C radioactivity. The data obtained indicate that following hydrolysis of the carbonyl-14- C-carbaryl, a small quantity of 14C02 was incorporated into lactose

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