Effects of chlordane on conditioned avoidance response, brain seizure threshold and open-field performance of prenatally-treated mice.

1. Three groups of six pregnant albino mice at the third stage of gestation were given chlordane 1 or 2.5 mg/kg body weight or olive oil 10 ml/kg. They were dosed orally for seven consecutive days.2. Ten young mice, regardless of sex, were randomly selected from the progeny of each group of treated mothers and tested for conditioned avoidance response, electroshock seizure threshold, and open-field performance.3. Offspring of chlordane-treated mice made fewer conditioned avoidance responses than the controls on each day of training.4. Electroshock seizure threshold was raised.5. In the open-field test, progeny of mothers receiving the larger dose were more active than controls. A dose x days interaction indicated a complex response of the chlordane-treated mice to experience in the open-field.6. The significance of these findings is discussed.