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INCREASED DURATION OF PSEUDOPREGNANCY ASSOCIATED WITH UTERINE DISTENSION IN THE RAT

Summary.: The duration of pseudopregnancy in rats was increased to 15·9±3·4 days (control 12·5 ±0·7) following surgical separation of the posterior parts of the uterine horns from their cervical attachments. Under these conditions, the uterine horns became distended with fluid. The uterine walls were stretched and thin, but appeared otherwise undamaged.

Deciduoma formation was readily induced in distended horns but the presence of deciduomata did not further prolong the duration of pseudopregnancy.