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Prenatal exposure to a dopamine receptor blocking agent such as haloperidol (given to the mother at a dose of 0.5 mg/kg s.c. from day 4 to day 15 of gestation) produced subtle behavioural changes in rat pups. Haloperidol decreased the rate of ultrasonic vocalization in 4-day-old male pups removed from the nest. The changes in ultrasonic emission elicited by in utero exposure to this neuroleptic were markedly different from those produced by its administration during the early postnatal period. Moreover, adult male rats treated prenatally with haloperidol exhibited a significant increase in the intensity of ultrasonic 22 kHz post-ejaculatory calls emitted during sexual behaviour. The duration of the period of the 22 kHz calls emission was also significantly increased by haloperidol treatment. These results confirm that ultrasonic vocalization in rats is a sensitive indicator of subtle changes in adverse treatments administered during development.
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