Comparative teratological study of insecticide Wofatox 50 EC (50% methyl-parathion) on chicken and pheasant fetuses.

An experimental insecticide Wofatox 50 EC, injected into the embryonated eggs from hens and pheasants at 12th day of incubation, caused a significantly diminished body mass, a high incidence of developmental malformations and embryonic mortalities at higher dose-levels. The lower, in plant protection practice used concentration was no teratogenic or lethal on embryos.