Abstract
Five groups of male Long-Evans rats were weaned and assigned randomly to one of the five treatment groups listed below: (1) Total isolates (raised in individual cages), (2) Contact isolates (M) (males separated from each other by screen), (3) Contact isolates (F) (male separated from female by screen), (4) Cohabitants (M) (two males per cage) and (5) Cohabitants (F) (male and female together). When tested as adults in pair encounters with stimulus males and females, groups 1–3 spent significantly less time grooming the perianal region of the stimulus animal when compared to groups 4 and 5. In addition to this finding, was the fact that in male sexual behavior, groups 1–3 showed significantly lower frequencies of intromission when compared to groups 4 and 5 when all were paired with a receptive female. It was concluded that postweaning isolation has effects on adult social and sexual behavior. A possible explanation of the findings is presented.
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