Abstract
Blastocysts from lactating or ovariectomized progesterone-maintained mice make as much [14C] carbon dioxide from exogenous glucose as do normal preimplantation blastocysts of comparable age. Carbon dioxide output drops at 5½ days postcoitum in both types of implantation delay. Carbohydrate metabolism slows down more quickly in blastocysts from ovariectomized progesterone-maintained females than in blastocysts from lactating females.

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