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RELEASE OF PROSTAGLANDIN F-2 DURING FOALING IN MARES

Summary.: The concentrations of PGF-2 in the peripheral blood of five foaling mares were measured by radioimmunoassay. Low levels of PGF-2 were detected as early as 1 week before foaling in two of the mares. These levels increased steadily, reaching a peak (1·74 ±0·44 ng/ml) during fetal expulsion. A relatively high PGF-2 level was found in samples collected 60 min after foaling.