concentrations of progesterone ( p4 ) , estradiol 17-beta ( e2 ) , testosterone ( t ) and prolactin ( prl ) were estimated by ria in porcine follicular fluid ( ff ) on 5th , 8th , 13th , 17th and 20th day of the estrous cycle and on 18th and 28th day of pregnancy .
C0014912
estradiol 17-beta
C0032961
pregnancy