Abstract
1. A single administration of luliberin to intact animais in a dose of 100 μg leads to a pronounced transitory rise in the LH and testosterone levels in the peripheral blood plasma. 2. Administration of luliberin 30 min before stress stimulates the secretion of LH by the pituitary, but does not prevent the stress-induced decrease in the testosterone level in the blood. 3. A single administration of 4500 units of hCG leads, in intact animals, to a sharp rise in the testosterone concentration, which remains at a high level for three days after stimulation of the gonads. 4. Preliminary stimulation of the testes by hCG prevents the stress-induced suppression of the testosterone level in the blood plasma; however, the reaction of the testes to the stimulating effect of hCG is decreased in this case.
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