Figure 1
From: Regulation of intraluteal production of prostaglandins

Secretion of (A) progesterone and (B) PGF2α from tissues from gilts on day 9 of the estrous cycle or day 17 of pseudopregnancy treated in vivo with a PGF2α analog (Cloprostenol) 10 hours prior to ovary removal. Progesterone and PGF2α were measured in media following 2 hour incubation of collected porcine luteal tissue. A, B – statistically different (P < 0.05) within day (from [20]).