Consistent individual variation in day, night, and GnRH-induced testosterone concentrations in House Sparrows ( Passer domesticus )

Highlights • GnRH-induced testosterone levels were similar to and correlated with levels observed during the night. • Both GnRH-induced and nighttime testosterone levels were highly repeatable across multiple sampling periods. • These data suggest field GnRH-induced testosterone measures will be use...

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Bibliographic Details
Published in:General and comparative endocrinology 2017-05, Vol.246, p.211-217
Main Authors: Needham, Katie B, Dochtermann, Ned A, Greives, Timothy J
Format: Article
Language:English
Subjects:
Animals
Avian
Circadian
Circadian Rhythm - physiology
Endocrinology & Metabolism
Gonadotropin-Releasing Hormone - pharmacology
HPG axis
Male
Reproduction - physiology
Reproductive fitness
Social Environment
Sparrows - physiology
Testosterone - blood
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Summary:Highlights • GnRH-induced testosterone levels were similar to and correlated with levels observed during the night. • Both GnRH-induced and nighttime testosterone levels were highly repeatable across multiple sampling periods. • These data suggest field GnRH-induced testosterone measures will be useful for assessing a HPG ‘phenotype’ and peak endogenous testosterone levels.
ISSN:0016-6480
1095-6840
DOI:10.1016/j.ygcen.2016.12.010