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Response from Cows Fed Diets Containing Fenthion or Fenitrothion^1,2,

Animal Science Department, Coastal Plain Station, Tifton, Georgia 31794
and Entomology Research Division, USDA, Tifton, Georgia

ABSTRACT

Eight diets each spiked with 0, 25, 50, or 100 ppm of either fenthion or fenitrothion were each fed to pairs of lactating Jersey cows for 28 days. Dietary fenthion was associated (P < .05) with feed intake. Cholinesterase activity of cows fed 25, 50, and 100 ppm fenthion was depressed (P < .05) 39, 70, and 81% compared with control cows; however, milk production was not affected. Consumption of diets containing fenitrothion did not depress (P > .05) feed intake, milk production, or blood cholinesterase activity.

Total peak residues consisting of fenthion, its sulfoxide and sulfone, and the sulfoxide of the oxygen analog at 7-day intervals in milk from cows fed the 25, 50, and 100 ppm diets averaged .016, .049, and .099 ppm; total residues in feces consisting of fenthion and its sulfoxide averaged from .042 to .308 ppm. Neither fenthion nor its oxygen analog were in urine, but totals of the sulfoxide and sulfone of fenthion and its oxygen analog averaged from .43 to 1.05 ppm. Milk, urine, and feces from cows fed as much as 100 ppm dietary fenitrothion contained neither fenitrothion, its oxygen analog, nor its cresol; but the amino analog of fenitrothion in milk, urine, and feces of cows fed the 25, 50, and 100 ppm diets averaged .002 to .017, 4.64 to 35.6, and .19 to .80 ppm. Seven days after feeding of diets containing fenthion or fenitrothion was terminated, residues could not be detected in milk, urine, or feces from any cow.

¹ Mention of a pesticide or a proprietary product in this paper does not constitute a recommendation or endorsement of the product.

² This work was supported in part by funds from the Animal Science Research Division, ARS, USDA.

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