the concentrations of growth hormone ( gh ) and prolactin ( prl ) were measured in serum harvested from umbilical arterial blood of fetal pigs from 40 to 112 days of gestation and the secretory patterns of these hormones determined in plasma obtained from jugular blood samples at 5 , 13 , 18 , and 24 wks after birth .
C0033371
prolactin
C1327616
secretory