Abstract
Laying hens were treated with permethrin at the rate of 20 mg per bird to determine efficacy against northern fowl mites Ornithonyssus sylviarum (Canestrini and Fanzago) and the dissipation of residues over a 42-day period. Permethrin provided greater than 99% control of mites for at least 42 days posttreatment as compared to malathion which did not substantially reduce mite infestations. Carbaryl and coumaphos treatment resulted in limited reductions with mite populations recovering by two to three weeks posttreatment.
Maximum residues of permethrin in breast muscle, body fat and the uropidium occurred on day 1 posttreatment and were still present in fatty tissue in detectable quantities on day 42. Residues in egg yolk appeared on day 3 posttreatment and peaked on day 7 with trace quantities still present on day 21. Permethrin was not found in egg white. Low residues were found in the liver and gizzard from day 1 through to day 7.
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Selected References
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