75 male albino rats were assigned to five groups: Low DDT (83 mg/kg), High DDT (207 mg/kg), Low Parathion (.74 mg/kg), High Parathion (1.86 mg/kg), and Control (peanut oil vehicle). Ss were placed for a 5-min. trial in a Hall open-field on each of 10 post-injection days. Exposure to parathion and DDT had no significant effect on open-field behavior of albino rats.
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