the temporal relationship between changes in mammary blood flow ( mbf ) and changes in the concentration of plasma prolactin , progesterone , estradiol-17beta , and cortisol , was examined in chronic sheep preparations undergoing spontaneous labor ( group i ) or labor induced by an infusion of dexamethasone ( 1 mg/24 h ) to the fetus ( group ii ) .
C0474461
spontaneous labor
C0022864
labor