Development of the intercaruncular areas during early gestation and establishment of the bovine placenta

摘要: Specimens were obtained from the uteri of heifers on Days 17, 18, 20 to 30 and at 3-day intervals up Day 45 gestation this material was examined by light microscopy, transmission scanning electron microscopy. A reduction in height uterine epithelium 18 first detectable maternal response presence blastocyst within lumen. The trophoblast could be preserved contact with attachment became progressively more complex between 21 30. Attachment occurred simultaneously intercaruncular caruncular regions near embryo subsequently spread towards each end blastocyst. Agranular leucocytes present until 22 but almost totally absent later specimens.