Prostaglandin F2 alpha and PGE2 in uterine lymph during the oestrous cycle in sheep.

The concentration of prostaglandin F2 alpha (PGF2 alpha) in uterine lymph remained low (less than 1 ng/ml) during the first two-thirds of the oestrous cycle in the non-pregnant sheep. However increased amounts of PGF2 alpha were present from day 12 onwards. The concentration of prostaglandin E2 in uterine lymph remained low (less than 0.43 ng/ml) throughout the cycle.