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First published online October 27, 2003
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Limits to sustained energy intake VIII. Resting metabolic rate and organ morphology of laboratory mice lactating at thermoneutrality

E. Król1,*, M. S. Johnson1,{dagger} and J. R. Speakman1,2

1 Aberdeen Centre for Energy Regulation and Obesity (ACERO), School of Biological Sciences, University of Aberdeen, Aberdeen AB24 2TZ, UK
2 ACERO, Division of Appetite and Energy Balance, Rowett Research Institute, Bucksburn, Aberdeen, AB21 9SB, UK



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  		Fig. 1. Resting metabolic rate (RMR) as a function of body mass for lactating female mice (filled circles; y=–18.16+1.25x; N=28) and non-reproductive female mice (N=15) measured on two separate occasions: NR-1 (open circles; y=2.88+0.51x) and NR-2 (open squares; y=5.99+0.41x). Both lactating and non-reproductive mice were exposed to 30°C.

 


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  		Fig. 2. Resting metabolic rate (RMR) prior to breeding (open circles) and at peak lactation (filled circles) as a function of body mass in mice exposed to (A) 30°C, (B) 21°C and (C) 8°C (N as in text; for statistical details, see Results).

 


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  		Fig. 3. Relationship between increase in resting metabolic rate (RMR) and increase in body mass at peak lactation above the levels measured prior to breeding, in mice exposed to hot (30°C), warm (21°C) and cold (8°C) temperatures (N as in text). The differences between the groups are not significant (for statistical details, see Results).

 




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