Abstract # 142:

Scheduled for Saturday, September 17, 2011 02:35 PM-03:05 PM: Session 19 (Salon F (Sixth Floor)) Oral Presentation


J. A. French
University of Nebraska at Omaha, Callitrichid Research Center, Omaha, NB 68182, USA

While reproductive function in female callitrichine primates has been widely studied, little is know about reproductive function in male callitrichines. In this talk, I will review patterns of gonadal hormone excretion throughout the lifetime of male marmosets. Like most mammals, androgen levels are high immediately following birth, remain low until 12 months of age, when levels reach the typical range for adult males. There are subtle social effects on hormone levels of sons living in natal family, but not of the magnitude seen in gonadal function in daughters. An interesting suite of endocrine changes accompany the transition from offspring to breeder. Androgen and cortisol levels drop upon pairing with a female, but estradiol levels become elevated. Androgen levels drop as male marmosets age, but not precipitously. Pituitary gonadotrophic hormone production and gonadal steroidogenesis remain intact in older males, as GnRH stimulation yields proportionately larger increases in androgen production in older males compared to younger adult males. Supported by NIH (HD042882).