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Parthenogenesis (PA) is the process by which an oocyte develops into an embryo without being fertilized.In the present study, it was showed that the porcine parthenote placentas were smaller than those of control but no obvious morphological differences existed at Day 28 of gestation.As we known, the parthenote placentas have decreased chorioallantoic folding, decreased chorionic ruggae, and defective vascular development.