The extent of the decidual cell reaction (DCR) on the 7th day of pregnancy and placental weight, foetal weight and placental morphology on the 18th day were found to be dependent on the genotype of the conceptus and the environment provided by the mother. No association could be found between the extent of the DCR and placental weight or placental morphology. There was, however, some suggestion of a positive association between decidual weight and foetal weight.
It is suggested that, in the presence of antigenic differences between mother and conceptus, the ability of a conceptus to elicit the DCR is impaired, or the rate of development of the decidual tissue is reduced.
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