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Fetal and placental weights in experimentally delayed implantation pregnancy.

Fetal and placental weights from rats in which implantation was delayed by ovariectomy and progesterone-estrone treatment were heavier than those from untreated rats at comparable days of gestation. When these hormones were given to ovariectomized pregnant rats with a normal preimplantation interval, the fetuses weighed the same as those from 2- or 10-day delayed rats. When blastocysts from either normal or delayed rats were transplanted to the empty horn of a unilaterally pregnant recipient, the body weights of the fetuses were not significantly different from those of normal rats. Only rats which were spayed and given exogenous hormones had fetuses and placentae heavier than normal controls. It is concluded that the heavier fetal and placental weights of delayed rats are not due to prolongation of the preimplantation period but are associated with ovariectomy and exogenous hormone treatment. (Endocrinology 86: 131, 1970)