MedicineEndocrinologyPhysiologyReproductive BiologyReproductive EndocrinologyReproductive PhysiologyGonadal EndocrinologyGonadal HormonesMale Reproductive EndocrinologyRodent EndocrinologyTesticular FunctionTesticular PhysiologyAge-related Testicular DevelopmentAging-related Androgen DeclineBiomarkers Of Testicular FunctionGonadal AgingMale Reproductive AgingSpermatogenic DeclineTesticular Function AssessmentTesticular Hormones
Serum testosterone levels, testicular LH binding and the spermatogenic cycle were analyzed in rats 4 and 22 mo of age. With age, serum testosterone levels decreased from 3.2 to 0.63 ng/ml serum. There was no age related decline in testicular LH binding or changes in the spermatogenic cycle.