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- W2002065269 abstract "Two experiments were carried out on the effects on ovulation of morphine sulfate administered prior to the preovulatory LH surge in the immature rat treated with PMSG. At the commencement of the experiments, rats were 30 days old. In Experiment 1 all rats were injected subcutaneously with 12 IU of PMSG at 1200 hr on day 30. Doses of 6, 12, 24 and 36 mg/kg of morphine were given IP at 1555 hr on day 32. Examination of oviducts on the morning of day 33 enabled the verification of ovulation as well as oocyte counts. Results suggest that the effect of morphine on ovulation is biphasic resulting in the stimulation of ovulation at low doses (6 mg/kg) and inhibition of ovulation at high doses (24 and 36 mg/kg). In Experiment 2, rats injected with a low dose of PMSG sufficient to result in ovarian maturation but not in a preovulatory LH surge, were injected on the eve of day 32 with either saline, 6 or 24 mg/kg morphine. The treatment of rats with 6 mg/kg morphine significantly increased mean ovulatory values compared with control and 24 mg/kg morphine conditions. Further, the percentage of 6 mg/kg treated rats ovulating was more than that of both control and 24 mg/kg morphine conditions. The failure of rats treated with 24 mg/kg morphine to display increments in ovulatory response similar to 6 mg/kg morphine injected rats suggests that increased ovulation is not due to the ability of morphine to cause adrenal progesterone release but is more probably the result of LH release at low doses of morphine." @default.
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- W2002065269 date "1983-08-01" @default.
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- W2002065269 title "The effects of morphine sulphate on ovulation in the immature rat treated with PMSG" @default.
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- W2002065269 doi "https://doi.org/10.1016/0091-3057(83)90051-5" @default.
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