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Table 1.

Comparison of egg composition for first- and last-laid eggs in female zebra finches laying 4-5 egg clutches

Shell
Albumen
Yolk
Egg orderDry mass (mg)%Dry mass (mg)%Dry mass (mg)%
First 60.0±6 25.2±2.3 74.9±11 31.4±2.9 104.8±21 43.4±4.2 
Last 62.1±5 24.7±1.8 84.4±8** 33.5±2.4** 105.7±14 41.8±2.4* 
Shell
Albumen
Yolk
Egg orderDry mass (mg)%Dry mass (mg)%Dry mass (mg)%
First 60.0±6 25.2±2.3 74.9±11 31.4±2.9 104.8±21 43.4±4.2 
Last 62.1±5 24.7±1.8 84.4±8** 33.5±2.4** 105.7±14 41.8±2.4* 

Dry mass values are means ± s.d. (N=23); %values are percentage of total egg dry mass.

Asterisks indicate significant difference: *P<0.05, **P<0.01.

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