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Persistence of Dasanit in Corn Silage and Effects of Feeding Dairy Cows the Treated Silage

Department of Animal Science, Coastal Plain Station
Southern Grain Insects Laboratory, ARS, USDA
ARS, USDA, Coastal Plain Station Tifton, Georgia 31794

ABSTRACT

When corn was sprayed in the field with Dasanit, _, _-diethyl _-[p-(methyl-sulfinyl) phenyl] phosphorothioate, at 0, .56, 1.12, and 2.24 kg per hectare and ensiled 1 day later, losses of Dasanit residues (Dasanit, Dasanit sulfone, Dasanit _-analog, and Dasanit _-analog sulfone) from time of application through harvesting of the treatments were 14, 6, and 17% of the amount applied. After 76 days of ensiling, com treated as above contained residues of 16.5, 27.8, and 50.6 parts per million which were equivalent to 73, 67, and 64% of the residues immediately after applying the .56, 1.12, and 2.24 kg treatments. Resulting silages were fed to 16 cows, 4 per treatment; and silage intakes, milk production, body weight gains, and blood cholinesterase activities of cows were severely and rapidly depressed by ingestion of Dasanit residues. These measures of performance were inversely related to amount of treatment, and recovery was slow. One cow fed silage produced from the 2.24 kg treatment died after ingesting Dasanit residues amounting to a total of 2.75 mgAg body weight during the first 7 days of experimental feeding. Dasanit and/or its metabolites were in milk, urine, and feces from cows fed silage from .56, 1.12, and 2.24 kg treatments. Total residues in milk, urine, and feces were .027, .036, and .020 parts per million or less. Milk, urine, and feces were free of residues within 1 wk after the cows were withdrawn from treated silage.