Hematological changes associated with egg production: estrogen dependence and repeatability

The Journal of Experimental Biology
Emily C WagnerT D Williams

Abstract

The 'cost of reproduction' (i.e. the trade-off between current reproduction and future fecundity and/or survival) is a central concept in life history theory, yet we still know very little about the physiological mechanisms underlying such costs. Recently it has been recognized that reproduction itself or the regulatory (hormonal) mechanisms underlying reproduction might result in 'costs' (cf. resource-allocation based mechanisms). As one example, it has been suggested that the decrease in hematocrit observed during egg production in birds might be due to antagonistic pleiotropic effects of estrogens. This could generate costs of reproduction by reducing oxygen-carrying capacity during subsequent aerobically demanding stages such as chick-provisioning. Here we show that the reduction in hematocrit during egg-laying is dependent on receptor-mediated actions of endogenous estrogens: blocking estrogen receptors using the anti-estrogen tamoxifen reduces the decrease in hematocrit during egg production in female zebra finches (Taeniopygia guttata) such that hematocrit at the 1-egg stage is not significantly different than pre-breeding, baseline values. We also show that both pre-breeding hematocrit and the decrease in hematocrit ass...Continue Reading

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Citations

Dec 11, 2013·Translational Stroke Research·Lana J MawhinneyMichael C Lewis
Dec 14, 2011·General and Comparative Endocrinology·Tony D Williams
Feb 9, 2010·Theriogenology·P F Watson, A Petrie
Oct 15, 2014·Asian Pacific Journal of Tropical Medicine·King Shimumbo NalubambaHetron Mweemba Munang'andu
Sep 30, 2018·The Journal of Experimental Biology·Kang Nian YapTony D Williams
Nov 28, 2018·Frontiers in Zoology·Melinda A FowlerTony D Williams
Jan 14, 2021·Ecology and Evolution·Thomas J BrownDavid S Richardson

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