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Associations among gastric emptying time (min), frequency of gastric contractions (mHz), and progesterone levels (ng/mL) in female rats during pregnancy and the estrous cycle. aP < 0.03, compared with control (day 0); bP < 0.002, compared with days 0 and 20; cP < 0.001, compared with day 14; dP < 0.001, compared with days 0 and 20; eP < 0.05, compared with proestrus; fP < 0.001 compared with estrous.
