Abstract
AbstractThe effect of the progestational uterus and preimplantation embryo on the time of appearance of LH-dependent progesterone secretion from pregnant and pseudopregnant (PSP) rat corpora lutea (CL) was studied. Two groups of experiments were performed: (1) pregnant and PSP rats were hysterectomized between Days 3 and 5 (Day 1 = vaginal estrus) and subsequently monitored for changes in serum progesterone levels following an injection of LH antiserum (LHAS) or normal horse serum (NHS) vehicle on Day 9 and, (2) Day 4 embryos were transferred to Day 3 PSP uteri; each rat was subsequently hysterectomized on Day 4 of PSP and treated with LHAS or NHS on Day 9. Progesterone levels were monitored as an index of luteal vitality. Progesterone secretion was not altered by NHS treatment in any group. LHAS treatment did not induce luteolysis in Day 3 pregnant rats or in PSP rats hysterectomized on Days 3 or 4. However, in rats hysterectomized on Day 4 or 5 of pregnancy, or hysterectomized on Day 5 of PSP, luteolysi...
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