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SHORTENING OF PSEUDOPREGNANCY AND THE OESTROUS CYCLE FOLLOWING A PREVIOUS PSEUDOPREGNANCY IN THE RAT

Summary.: When two consecutive pseudopregnancies were induced in normal female Hooded Wistar rats, the duration of the second pseudopregnancy (12·6±0·18 days) was shorter than that of the first (13·2±0·20 days, P<0·05). This was associated with a shortening of vaginal oestrus in the second pseudopregnancy. The duration of the oestrous cycle following pseudopregnancy was also shorter than that of the cycle preceding pseudopregnancy (3·7±0·17 days versus 4·6±0·18 days, P<0·01).