The decline in yolk progesterone concentrations during incubation is dependent on embryonic development in the European starling

Highlights ► We examined the metabolism of exogenous progesterone in European starling eggs. ► We also describe a focal freezing technique that terminates embryonic development. ► Embryonic development is critical for in ovo metabolism of progesterone to occur. ► Levels of water-soluble metabolites...

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Bibliographic Details
Published in:General and comparative endocrinology 2012-05, Vol.176 (3), p.415-419
Main Authors: Paitz, Ryan T, Casto, Joseph M
Format: Article
Language:English
Subjects:
Animals
birds
Egg Yolk - metabolism
eggs
Embryo
embryogenesis
Endocrinology & Metabolism
European starling
Female
Maternal effects
Metabolism
mothers
oviposition
Oviposition - physiology
phenotype
progeny
Progesterone
Progesterone - metabolism
Random Allocation
Starlings - embryology
Starlings - metabolism
steroid hormones
steroids
Sturnus vulgaris
Yolk steroids
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Summary:Highlights ► We examined the metabolism of exogenous progesterone in European starling eggs. ► We also describe a focal freezing technique that terminates embryonic development. ► Embryonic development is critical for in ovo metabolism of progesterone to occur. ► Levels of water-soluble metabolites increase over the first 5 days of incubation. ► Progesterone is converted to a polar metabolite that is subsequently conjugated.
ISSN:0016-6480
1095-6840
DOI:10.1016/j.ygcen.2011.12.014