Embryonic and uterine development during early pregnancy in pigs

J Reprod Fertil Suppl. 1990;40:261-77.


Comparison of the timing of pig preimplantation development, alterations in the ultrastructure of embryonic germ layers, and cytological changes of the uterine epithelial cells leads to the supposition that a close relationship exists between embryonic and uterine development during early pregnancy. The results of in-vitro studies of embryonic development and of experiments concerning asynchrony between embryos and uterine environment confirm this supposition, especially as far as the post-hatching period is concerned. It is suggested that successive steps in embryonic germ layer differentiation may induce specific developmental events and secretory activity of the embryos. A mutual influence of maternal and embryonic tissues appears to exist, but we can only speculate about the causes of many of the described phenomena.

Publication types

  • Review

MeSH terms

  • Animals
  • Embryonic and Fetal Development*
  • Female
  • Pregnancy
  • Pregnancy, Animal / physiology*
  • Swine / physiology*
  • Uterus / physiology*