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Social play in juvenile rats prenatally exposed to alcohol.

Offspring of rat dams that consumed isocaloric liquid diets containing either 35% or 0% ethanol-derived calories (EDC) from gestation days 6-20 were tested for play-fighting behavior as juveniles. Offspring from a group of dams maintained on standard lab chow and water throughout gestation were also included. Animals were tested in pairs, with offspring from each of the three prenatal treatment conditions (35% EDC, 0% EDC, and lab chow) being paired with another same-sex animal from one of these three prenatal treatment groups. Although play-fighting in juveniles is normally sexually dimorphic, this normal pattern was absent in juveniles prenatally exposed to alcohol. Male alcohol-exposed offspring displayed feminized behavior while female alcohol-exposed offspring showed masculinized behavior. This reversal of the normal sexually dimorphic aspects of play suggests that some of the behavioral disturbances associated with prenatal alcohol exposure may result, in part, from an alcohol-induced disruption of the hormonal environment in which the fetus develops.