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Fig. 5. Cost of transport (J kg–1 m–1) decreases
with body mass among >90 different species of birds and mammals
(Langman et al., 1995;
Taylor et al., 1982) but does
not change with body mass within horses. For clarity, only the mouse and
elephant data points are shown for the inter-specific relationship, although
the line is derived from data representing >90 species. Open squares are
mean values for each size range of horses from the present study and closed
squares are mean values from the literature (N=3,
Hoyt and Taylor, 1981;
N=5, Eaton et al.,
1995; N=4, Minetti et
al., 1999; N=4, Pagan
and Hintz, 1986; N=7,
Potard et al., 1998). The cost
of transport was calculated as the linear slope of the rate of oxygen
consumption versus trotting speed for horses. We assumed an energetic
equivalent of 20.1 J ml–1 O2. The scaling
relationship for the horse data was calculated using a least-squares linear
regression, following Taylor et al.
(1982). The 95% confidence
limits of the exponent for the horse line are ±0.138.
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