purified porcine relaxin ( 3000 u/mg ) was administered into the cervical os of primiparous beef heifers on day 278 of gestation ( approximately 5 days before parturition normally occurs ) to determine its effects on the induction of parturition , changes in progesterone , estrone ( e1 ) , 17 beta-estradiol ( 17 beta-e2 ) , cervical dilation , and pelvic relaxation .
C0032961
gestation
C0014912
17 beta-estradiol