title: Luteotrophic effect of the rabbit blastocyst.
abstract: Progesterone concentrations in peripheral plasma of 27 rabbits were determined by radioimmunoassay daily from Days 1 to 7. The rate of increase was significantly higher in pregnant than in pseudopregnant rabbits from Days 5 to 7 (P less than 0.02), but not before Day 5. Transfer of Day-4 or -5 blastocysts to synchronous, pseudo-pregnant recipients resulted in a significant rise in progesterone levels in comparison with those in sham-operated controls (P less than 0.01) or pseudopregnant does (P less than 0.01).
mesh_terms: D000818:Animals; D001755:Blastocyst / Q000502:physiology*; D003340:Corpus Luteum Maintenance; D005260:Female; D011247:Pregnancy; D011374:Progesterone / Q000097:blood; D011555:Pseudopregnancy; D011817:Rabbits
chemical_list: D011374:Progesterone