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Limits to sustained energy intake : II. Inter-relationships between resting metabolic rate, life-history traits and morphology in MUS MUSCULUS

M. S. Johnson, S. C. Thomson and J. R. Speakman^*

Aberdeen Centre for Energy Regulation and Obesity (ACERO), Department of Zoology, University of Aberdeen, Aberdeen AB24 2TZ, Scotland, UK

View larger version (12K): [in a new window]   Fig. 1. Resting metabolic rate (RMR) prior to breeding and at peak lactation for females raising natural (filled columns, N=71) and manipulated (open columns, N=37) litters. Values are means ±1 S.E.M.

View larger version (16K): [in a new window]   Fig. 2. Relationship between resting metabolic rate (RMR) and body mass prior to breeding (filled circles) and at peak lactation (open circles) of females with unmanipulated (A) and manipulated (B) litters. Least-squares regression lines fitted to the two sets of data are shown and are described by (A) y=0.79x+0.1 (F1,69=5.4, P=0.023) prior to breeding and y=1.92x-38.0 (F1,69=17.5, P=0.001) at peak lactation, and (B) relationship prior to breeding not significant (P=0.156) and y=2.00 x-44.7 (F1,35=22.16, P=0.001) at peak lactation.

View larger version (21K): [in a new window]   Fig. 3. Relationship between pre-breeding resting metabolic rate (RMR) and RMR at peak lactation in females with unmanipulated litters. The dashed line shows the fitted regression, described by the equation y=0.74x+31.2, and the solid line is the line of equality.

View larger version (15K): [in a new window]   Fig. 4. Relationship between resting metabolic rate at peak lactation (RMRL) and (A) litter size at birth (y=2.23x+3.2) and (B) litter size at peak lactation in females with unmanipulated litters (y=2.41x+2.1).

View larger version (13K): [in a new window]   Fig. 5. Relationship between (A) the mass of the litter at birth and the maternal resting metabolic rate at peak lactation (RMRL) (y=3.16x+5.7), (B) the asymptotic food intake and maternal RMRL (y=2.55x+13.4) and (C) the mean pup mass and maternal RMRL (y=1.2x+12.5) for females raising unmanipulated litters.

View larger version (16K): [in a new window]   Fig. 6. Relationship between the extent of litter manipulation (number of pups added or removed) and the increase in maternal mass from pre-breeding to peak lactation. The relationship is described by y=0.48x+17.6.