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A 25 micrograms dose of testosterone propionate injected at 4 days of age induced 90% anovulation at 100 days of age. The systemic administration of orciprenaline (8 or 16 micrograms) or yohimbine (100 micrograms) did not prevent androgenization. Twenty-five or fifty micrograms of orciprenaline injected intraventricularly reduced only partially (to 54 and 67% respectively) the effectiveness of androgenization. We concluded that beta-adrenergic receptor stimulation had a very limited ability to prevent androgenization, since the beta-stimulation obtained directly with orciprenaline prevented androgenization to a very limited extent, while the possible indirect stimulation through an increase in norepinephrine endogenous release by alpha-2 receptor blocker yohimbine was ineffective.
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M J Vidal, and
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M J Vidal, and
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M J Vidal, and
E Aguilar
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