New Zealand white rabbits were given cypermethrin by gastric intubation at the rate of 0, 300, 600 and 1000 mg per 1 kg on the 4th, 10th, 13th and 18th day of their pregnancies. The fetuses were aborted on day 28. AH 166 fetuses were examined for external, internal and skeletal malformations or variations. There was no evidence of teratogenic action of cypermethrin in the rabbits; however, embryotoxic effects were detected. The results may have some value for prenatal toxicology of other mammal species and humans poisoned by cypermethrin, and of some benefit for the ecotoxicology of hares in the area where this pesticide is applied as a plant protection agent.
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