Plasma Progesterone Concentrations during Pregnancy and Lactation in Mongolian gerbils (Meriones unguiculatus)

摘要

Plasma progesterone (P_4) concentrations during pregnancy and lactation in Mongolian gerbils were measured by enzymeimmunoassay (EIA). The P_4 concentration Was found to increase rapidly after mating and reach a peak on day 6 of pregnancy. The Maximum level (166.0 to 184.8 ng/ml) was maintained to day 12 and then decreased to a Plateau at a moderate level until day 21. The P_4 concentration declined to its lowest level On day 24 of pregnancy, one day before parturition. The P_4 concentration on the first day of Lactation was similar to that on the last day of pregnancy.