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Relationship between progesterone secretion and peripheral plasma levels of luteinizing hormone during pregnancy and postpartum period in hamsters.

Levels of progesterone in the ovarian vein blood and LH in the peripheral plasma were measured by respective radioimmunoassays throughout pregnancy and postpartum period in hamsters. The secretion of LH or progesterone showed no significant fluctuations prior to or in association with implantation on Days 3 and 4 of pregnancy. During the second 1/2 of gestation ovarian output of progesterone doubled and the concentration of LH declined to values significantly (p<.01) less than those found during the early pregnancy or the diestrous phase of the cycle. During the postpartum period progesterone secretion dropped below values found on Day 1 of pregnancy and LH levels rose severalfold over those found in the prepartum animals. The stimulus provided by suckling failed to reduce high LH values to levels present in the second of pregnancy. In general a negative relationship was observed between the ovarian secretion of progesterone and circulating levels of LH both during pregnancy and the postpartum period.