The suprachiasmatic nucleus (SCN) of the hypothalamus is the locus of a master circadian clock controlling behavioral and physiological rhythms, including rhythmic secretion of gonadal hormones. Gonadectomy results in marked alteration of circadian behaviors, including lengthened free-running period, decreased precision of daily onset of running, and elimination of early-evening but not late-ni...

In many vertebrates, breeding seasons are protracted and mating behavior is temporally associated with gonadal growth and increased sex steroid hormone secretion. In the red-sided garter snake (Thamnophis sirtalis parietalis), mating behavior is restricted to the 2-4 weeks immediately following emergence from winter dormancy. During this period mating behavior is sex-specific: chin-rubbing is e...

Wexler BC: Effect of an oral contraceptive drug on nonarteriosclerotic male and female virgin rats vs arteriosclerotic, male and female breeder rats. Angiology 25: 197-227, 1974 Aoki K: Experimental studies on the relationship between endocrine organs and hypertension in spontaneously hypertensive rats. I. Effects of hypophyscctomy, adrenalectomy, thyroidectomy, nephrectomy and sympathectomy on...

Wexler BC: Effect of an oral contraceptive drug on nonarteriosclerotic male and female virgin rats vs arteriosclerotic, male and female breeder rats. Angiology 25: 197-227, 1974 Aoki K: Experimental studies on the relationship between endocrine organs and hypertension in spontaneously hypertensive rats. I. Effects of hypophyscctomy, adrenalectomy, thyroidectomy, nephrectomy and sympathectomy on...

The aim of the present study was to explore the effects of 8-OH-DPAT, 5-HT1A receptor agonist and NAN-190, 5-HT1A receptor antagonist on anxiety-related behavior in the adult gonadectomized (GDX) male rats. Moreover, another goal of this work was to investigate whether the combination of 8-OH-DPAT or NAN-190 plus testosterone propionate (TP) could affect anxiety-like behavior more than TP alone...