Excretion cyclodienes

In terrestrial animals, cyclodienes such as dieldrin, like other refractive lipophilic pollutants, can be excreted in their unchanged forms, notably with lipoproteins, which are exported into milk (mammals), eggs (birds, reptiles, insects), or developing... 

Finally, conventional pesticides under certain conditions may induce growth abnormalities which preclude survival of the insects concerned. This can be manifest during pupation and eclosion of adults. It appears to result from sublethal exposure to certain pesticides such as the cyclodienes, where the products of metabolism are toxic and must be excreted to complete the detoxification process. If excretion of the metabolites has not occurred before the pre-pupal stage is reached, they remain in the insect and interfere with morphogenesis. 

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