PMID: 3770430Jun 1, 1986Paper

Variations in plasma corticosterone, estrone, estradiol-17 beta, and progesterone concentrations with forced renesting, molt, and body weight of captive female American kestrels

General and Comparative Endocrinology
N B RehderP C Laguë

Abstract

Corticosterone, progesterone, estradiol-17 beta, and estrone were quantified in plasma collected weekly (April-September) from renesting and nonlaying female American kestrels (Falco sparverius) paired with males in captivity. Hormone levels and body weights for laying females were maximal during courtship and egg-laying periods, while those for non-layers showed no such distinct peaks. This demonstrated that these profiles were not controlled solely by photoperiod. Plasma corticosterone levels were elevated in all females during August and September when kestrels are preparing for migration. For laying females, body weight was positively correlated with plasma estrogen levels. A low spring body weight gain, and not stress, may have prevented the females from breeding in captivity. The photoperiodic control of molt did not appear to be mediated directly by the hormones studied, since there were no changes in hormone levels associated with the onset of molt.

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Citations

Apr 28, 2007·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Airica M StaleySteven L Monfort
Sep 25, 2002·General and Comparative Endocrinology·L Michael Romero
Feb 28, 2003·General and Comparative Endocrinology·Maria Elena Pereyra, John C Wingfield
Dec 7, 2006·Biology Letters·Stephanie M CorreaPatricia A Johnson
Mar 30, 2010·General and Comparative Endocrinology·Julio BlasFernando Hiraldo
Apr 1, 1989·General and Comparative Endocrinology·T Meijer, H Schwabl
Dec 1, 1990·General and Comparative Endocrinology·C L Gratto-TrevorF Cooke
Mar 13, 2003·Pflügers Archiv : European journal of physiology·Francisco J Muñoz, Mónica Fuente
Sep 8, 2020·Doklady Biological Sciences : Proceedings of the Academy of Sciences of the USSR, Biological Sciences Sections·A A MarchenkoM Ya Goretskaya
Jul 17, 2020·Frontiers in Physiology·Charlene HanlonGrégoy Y Bédécarrats
Jan 20, 2021·Zoo Biology·Marcel H BlankRicardo J G Pereira

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