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The effects of the dopamine antagonist pimozide on the preimplantation delay phase of mink gestation were investigated in field and laboratory trials. Three doses of 0.1 mg pimozide in acetic acid administered on the 7th, 9th and 11th days after mating abbreviated gestation in Pastel kit female mink to a mean (+/- SEM) of 45.5 +/- 0.5 days, 10 days less than that observed in mink treated with vehicle only (55.6 +/- 0.6 days). In laboratory trials, four doses of 0.1 mg pimozide on the 7th, 9th, 11th and 13th day after mating resulted in embryo implantation at a mean of 25 +/- 4.3 days after mating while vehicle-treated control animals had mean preimplantation delay of 37 +/- 3.1 days. Luteal activation in the pimozide-treated group, as indicated by a rapid increase in circulating progesterone, began within 2 days after the first pimozide injection. No increase was observed in vehicle-treated mink until 6 or more days after the initiation of injections or 13 days after mating. It was concluded that pimozide, presumably by permitting endogenous secretion of prolactin, can induce precocious luteal activation and embryo implantation in the mink.

Precocious Induction of Luteal Activation and Termination of Delayed Implantation in Mink with the Dopamine Antagonist Pimozide