Non-invasive measurement of 11-ketotestosterone, cortisol and androstenedione in male three-spined stickleback (Gasterosteus aculeatus)
The androgen 11-ketotestosterone (11-KT) plays an important role in reproductive physiology and behaviour in male teleosts. In the three-spined stickleback, Gasterosteus aculeatus, the plasma concentrations of 11-KT are related to the breeding status of the fish. Sticklebacks are relatively small (generally less than 1 g) and in order to obtain sufficient plasma for assay of […]
A simplified method for extracting androgens from avian egg yolks
Abstract 10.1002/zoo.20221.abs Female birds deposit significant amounts of steroid hormones into the yolks of their eggs. Studies have demonstrated that these hormones, particularly androgens, affect nestling growth and development. In order to measure androgen concentrations in avian egg yolks, most authors follow the extraction methods outlined by Schwabl (1993. Proc. Nat. Acad. Sci. USA 90:11446–11450). […]
Urinary androstenedione and luteinizing hormone concentrations during musth in a mature African elephant
Abstract 10.1002/zoo.1430080207.abs Musth has not been well documented in captive African elephants. A 37-year-old African bull elephant in the Kansas City Zoological Park was observed during periods of behavioral musth and non-musth. Androstenedione and luteinizing hormone (LH) concentrations in urine were measured by radioimmunoassay. Urinary androstenedione and LH levels were significantly higher in musth urine […]
Maternal gestational androgens are associated with decreased juvenile play in white-faced marmosets (Callithrix geoffroyi)
Exposure to androgens during prenatal development shapes both physiological and behavioral developmental trajectories. Notably, in rhesus macaques, prenatal androgen exposure has been shown to increase rough-and-tumble play, a prominent behavioral feature in males during the juvenile period in primates. While macaques are an Old World, polygamous species with marked sexually dimorphic behavior, New World callitrichine […]