Follicular development and plasma yolk precursor dynamics through the laying cycle in the European starling (Sturnus vulgaris)

Physiological and Biochemical Zoology : PBZ
W O ChallengerF Vézina

Abstract

We investigated the quantitative matching of plasma yolk precursor supply (the plasma pool) to follicle demand during yolk formation in European starlings (Sturnus vulgaris). Plasma concentrations of the two yolk precursors, vitellogenin (VTG) and very low density lipoprotein (VLDL), were only elevated coincident with rapid yolk development (RYD) and matched variation in total yolky follicle mass. VTG and VLDL were low (<0.4 microg/mL and <4.2 mg/mL, respectively) in nonbreeders and prebreeders with no yolky follicles, and at clutch completion. They increased to 4.02 microg/mL and 19.4 mg/mL in birds with a full follicle hierarchy (F1-F4), and concentrations then remained high and actually increased up to the point where only a single, yolky (F1) follicle remained. However, there was some evidence for mismatching of supply and demand: (a) precursor concentrations increased throughout the laying cycle even though the number of developing follicles decreased. We suggest that this is because of a requirement to maintain a large precursor pool to maintain high uptake rates; and (b) in birds with a full follicle hierarchy, precursor concentrations were negatively correlated with total follicle mass. This suggests that high uptake ra...Continue Reading

Citations

Feb 28, 2003·General and Comparative Endocrinology·Katrina G Salvante, Tony D Williams
Dec 1, 2007·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Tony D Williams
Mar 29, 2014·PloS One·Laura B ReparazSamuel P Caro
May 23, 2007·General and Comparative Endocrinology·Susannah S French, Michael C Moore
Mar 26, 2013·Biological Reviews of the Cambridge Philosophical Society·Sacha Haywood
Mar 26, 2010·Journal of Experimental Zoology. Part A, Ecological Genetics and Physiology·Vivian C GoerlichTon G G Groothuis
Aug 14, 2012·General and Comparative Endocrinology·Sonja V SchaperMarcel E Visser
Nov 21, 2014·Oecologia·Holly L HenninOliver P Love
Aug 26, 2016·Frontiers in Zoology·Joel L PickBarbara Tschirren
Mar 5, 2020·Proceedings. Biological Sciences·Erick González-MedinaGuillermo Fernández
Feb 6, 2013·Journal of Biological Rhythms·Katrina G SalvanteKeith W Sockman
Jan 22, 2008·The Journal of Experimental Biology·Emily C WagnerTony D Williams
Nov 12, 2003·The Journal of Experimental Biology·François VézinaTony D Williams
Dec 12, 2003·The Journal of Experimental Biology·T D Williams, C E Ames

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