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Table 2.

Analysis of egg mass (from Experiment 1), in terms of food quality,temperature treatment, maximum temperature, and interactions between food quality and temperature treatment, and food quality and maximum temperature

Egg mass
Termd.f.Wald statistic (χ2)P value
Minimal model    
    Food quality 41.05 <0.001 
    Temperature treatment 1.65 0.439 
    Maximum temperature 2.17 0.140 
    Food quality×Temperature treatment 9.24 0.010 
    Food quality×Maximum temperature 5.65 0.017 
Excluded terms    
    Mean temperature 2.03 0.154 
    Week 0.93 0.336 
    Minimum temperature 0.63 0.427 
    Female mass 0.03 0.872 
Egg mass
Termd.f.Wald statistic (χ2)P value
Minimal model    
    Food quality 41.05 <0.001 
    Temperature treatment 1.65 0.439 
    Maximum temperature 2.17 0.140 
    Food quality×Temperature treatment 9.24 0.010 
    Food quality×Maximum temperature 5.65 0.017 
Excluded terms    
    Mean temperature 2.03 0.154 
    Week 0.93 0.336 
    Minimum temperature 0.63 0.427 
    Female mass 0.03 0.872 

A random term of `bird identities and calorimeter chamber' was used(χ2=14.45; d.f.=1; P<0.001) to account for the non-independence of conditions from different chambers, and repeated measures of the same birds.

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