Abstract
The effect of intrahypothalamic infusions of dopamine (DA) and noradrenaline (NA) on ovulation in the mature cycling rat were investigated. Neither the infusion of DA (40μg) nor NA (40μg) into the median eminence of Nembutal-blocked pro-oestrous rats between 14:00 and 16:00 hours was able to restore ovulation. Pretreatment with the monoamine oxidase inhibitor iproniazid phosphate (40mg/kg) at 15:00 hours on the day preceding pro-oestrus did not affect the response to DA or NA. Infusions of NA but not DA between 10:30 and 11:30 on pro-oestrus induced ovulation in rats pretreated with iproniazid. The data fail to support the presence of a dopaminergic or noradrenergic mechanism during the critical period. A noradrenergic component may be involved during early pro-oestrus.
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