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First published online June 16, 2005
Journal of Experimental Biology 208, 2533-2538 (2005)
Published by The Company of Biologists 2005
doi: 10.1242/jeb.01675
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The metabolic cost of egg production is repeatable

François Vézina* and Tony D. Williams

Department of Biological Sciences, Simon Fraser University, 8888 University Drive, Burnaby, V5A 1S6, Canada



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  		Fig. 1. Least square mean resting metabolic rate (RMR) in non-breeding (NB), laying (LY) and chick-rearing (CK) stage of female zebra finches. Values are computed from a repeated measures ANCOVA controlling for the effect of body mass. Different letters indicate significant differences between groups.

 


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  		Fig. 2. Correlation between residual resting metabolic rate (RMR) measured repeatedly in male zebra finches. (A) First vs second measurement, (B) second vs third measurement, (C) first vs third measurement. Residuals are controlling for the effect of body mass.

 


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  		Fig. 3. Correlation between first and second resting metabolic rate (RMR) measured at (A) the non-breeding (NB) stage and (B) the laying (LY) stage in female zebra finches. Residuals correct for the effect of body mass.

 


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  		Fig. 4. Least square mean resting metabolic rate (RMR) measured twice in non-breeding (NB) and laying (LY) females zebra finches. Values are computed from a repeated measures ANCOVA and control for the effect of body mass. An asterisk indicates significant difference between measurements within stage.

 

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© The Company of Biologists Ltd 2005