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The effects of administering technical propyl thiopyro- phosphate at a concentration of 200 ppm in the feed of laying hens were studied over a 52-week period. The estimated mean daily intake of this insecticide was 23.4 mg per hen. This treatment resulted in excellent control of larvae of the house fly, Musca domestica L., and of Chrysomya megacephala (F.) in the droppings from these hens, but poor control of larvae of Parasarcophaga argyrostoma (Robineau-Desvoidy) and Fannia pusio (Wiedemann). No hen mortality occurred that could be attributed to the insecticidal treatment. Inhibition of plasma cholinesterase activity was rapid and fluctuated between 20 and 50%. but recovery of enzyme activity also was rapid after removal of the birds from treatment. Overall feed consumption, weight-gain, egg production, egg weight, interior egg quality, and shell thickness were normal. Feed efficiency was greater, on the other hand, in the propyl thiopyrophosphate-treated hens than in the control hens. Eggs from treated hens had no detectable off-flavors or off-odors. Eggs and tissues from hens slaughtered while on treatment and 7, 14, and 21 days after removal from treatment were analyzed by the potentiometric method for residue analysis by cholinesterase inhibition after oxidation with hydrogen peroxide-acetic acid. The corrected limits of detectability for the various tissues were: yolk 0.03, albumin 0.07, breast muscle 0.05, fat 0.07, and liver 0.22 ppm. No propyl thiopyrophosphate residues beyond the sensitivity of the analytical method were detected.
Document Type: Research Article
Publication date: December 1, 1969
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Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.