the effect of pregnancy on concentrations of prostaglandins e2 , f2 alpha and 6-keto-prostaglandin f1 alpha ( pge2 , pgf2 alpha and 6-keto-pgf1 alpha ) in utero-ovarian venous plasma was examined in ewes on days 10 through 14 after estrus , an interval which includes the critical period for maternal recognition of pregnancy .
C0012472
pge2
C0032961
pregnancy