In random-bred Q mice, decidual weight on the 7th day of pregnancy and placental and fetal weight on the 18th day of pregnancy were compared in nulliparous and uniparous females and those which had undergone a previous pseudopregnancy with or without induction of decidual tissue by arachis oil.
The effect of parity was to increase maternal weight and placental weight but to decrease fetal weight. There was no effect on decidual weight. Pseudopregnancy with or without the induction of deciduomata failed to mimic the effects of parity on fetal weight and placental weight.
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