Document Detail

Variability of yolk testosterone concentrations during the reproductive cycle of Japanese quail.
MedLine Citation:
PMID:  19720153     Owner:  NLM     Status:  MEDLINE    
Deposition of yolk androgens can vary among females as well as within eggs of one female. Numerous external and internal factors can contribute to this variability. In our study, we investigated the systemic variation of yolk testosterone concentrations during the laying cycle of Japanese quail reared in stable environmental and social conditions. Testosterone was analysed in three eggs collected per female at the beginning, top and the end of a reproductive period and the extent of inter- and intra-female differences in yolk deposition of this androgen was quantified. Yolk testosterone concentrations and the yolk testosterone content decreased from the early to the latest stage of reproductive period. Testosterone concentrations in the egg yolk as well as the age-dependent pattern significantly differed among individual females. We found high repeatability of yolk testosterone among 3 eggs of individual females together with high repeatability between 3 stages of the reproductive cycle. Testosterone in the egg yolk correlated positively with eggshell weight. Our results suggest that precocial birds with long laying sequences display higher inter-female differences in yolk testosterone concentrations compared with intra-individual variability. The decreased testosterone deposition with age may influence the development and behaviour of the young hatched at different stages of the female's reproductive cycle.
Monika Okuliarov??; Peter Skrob??nek; Michal Zeman
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-08-28
Journal Detail:
Title:  Comparative biochemistry and physiology. Part A, Molecular & integrative physiology     Volume:  154     ISSN:  1531-4332     ISO Abbreviation:  Comp. Biochem. Physiol., Part A Mol. Integr. Physiol.     Publication Date:  2009 Dec 
Date Detail:
Created Date:  2009-10-12     Completed Date:  2010-01-11     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9806096     Medline TA:  Comp Biochem Physiol A Mol Integr Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  530-4     Citation Subset:  IM    
Department of Animal Physiology and Ethology, Faculty of Natural Sciences, Comenius University, Bratislava, Slovak Republic.
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MeSH Terms
Coturnix / physiology*
Egg Yolk / metabolism*
Testosterone / metabolism*
Reg. No./Substance:

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