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Table 1.

Oxygen consumption, carbon dioxide production, respiratory exchange ratio, carbohydrate and lipid oxidation in birds exposed to 22, 15, 10 or 5°C

Temperature (°C)
22 (Control)15105
O2 (ml min-1 kg-1 body mass) 42.9±1.3a 52.7±2.1a,b 61.4±2.4b,c 74.0±7.0c 
CO2 (ml min-1 kg-1 body mass) 32.1±1.2a 38.8±1.4a,b 45.6±1.7b,c 54.9±5.7c 
RER 0.747±0.005a 0.737±0.005a 0.742±0.008a 0.739±0.008a 
CHOox (ml O2 min-1 kg-1 body mass) 5.9±0.8a 5.2±0.8a 7.2±1.7a 8.7±3.0a 
FATox (ml O2 min-1 kg-1 body mass) 33.8±0.7a 44.3±2.6a,b 51.1±3.1b,c 62.1±4.6c 
Temperature (°C)
22 (Control)15105
O2 (ml min-1 kg-1 body mass) 42.9±1.3a 52.7±2.1a,b 61.4±2.4b,c 74.0±7.0c 
CO2 (ml min-1 kg-1 body mass) 32.1±1.2a 38.8±1.4a,b 45.6±1.7b,c 54.9±5.7c 
RER 0.747±0.005a 0.737±0.005a 0.742±0.008a 0.739±0.008a 
CHOox (ml O2 min-1 kg-1 body mass) 5.9±0.8a 5.2±0.8a 7.2±1.7a 8.7±3.0a 
FATox (ml O2 min-1 kg-1 body mass) 33.8±0.7a 44.3±2.6a,b 51.1±3.1b,c 62.1±4.6c 

O2, rate of oxygen consumption; CO2, rate of carbon dioxide production; RER, respiratory exchange ratio; CHOox,carbohydrate oxidation; FATox, lipid oxidation.

Values are means ± s.e.m. (N=6). Values not sharing a common superscript letter are significantly different(P<0.05).

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