Abstract
The role of oxytocin in male copulatory performance was reexamined in rats. Adult male rats were trained seven times for copulatory behavior, at weekly intervals. Oxytocin, either intraperitoneally injected (200 ng/rat) or intracerebroventricularly infused (1 ng/rat in 4 μl saline) 60 and 5 min, respectively, before the eighth test, significantly shortened both the ejaculation latency and the postejaculatory interval. The intracerebroventricular infusion of saline alone (4 μl/rat) had no effect at all.
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