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Corpora lutea of ewes bearing ovarian autotransplants were infused for 4 h with prostaglandin F₂ (PGF₂) (10 µg/h), PGF₂ + PGE₂ (10 µg/h of each), PGE₂ (10 µg/h) or saline on day 10 of the cycle. Ovarian venous blood obtained before, during, and up to 12 h after the infusion period, was assayed for progesterone. Prostaglandin F₂ produced an immediate, rapid and sustained decline in progesterone secretion, but infusion of PGE₂ together with PGF₂ prevented the decline until after the infusion. Progesterone secretion was unaffected by infusion of PGE₂ alone. Oestrous behaviour was observed in four out of seven animals infused with PGF₂ but in only one out of six infused with PGF₂ + PGE₂. None of the animals infused with PGE₂ alone or saline only came into heat.