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First published online August 17, 2007
Journal of Experimental Biology 210, 3043-3053 (2007)
Published by The Company of Biologists 2007
doi: 10.1242/jeb.009381
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Effects of mass and body composition on fasting fuel utilisation in grey seal pups (Halichoerus grypus Fabricius): an experimental study using supplementary feeding

Kimberley A. Bennett1,*, John R. Speakman2, Simon E. W. Moss1, Paddy Pomeroy1 and Mike A. Fedak1

1 NERC Sea Mammal Research Unit, Gatty Marine Laboratory, University of St Andrews, Fife, KY16 8LB, UK
2 School of Biological Sciences, University of Aberdeen, AB24 2TZ, UK


Figure 1
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  		Fig. 1. Daily rate of mass loss (means ± s.e.m.) at 3-day intervals, excluding the additional mass of the fed fish, in Fed (open triangles; N=7) and Control (closed squares; N=12) pups. *Significant difference between groups (P<0.05). a, b, c (black, Fed; grey, Control) denote a significant difference (P<0.05) from day 4, 7 and 10, respectively, within group.

 

Figure 2
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  		Fig. 2. (A) Mean daily rate of mass loss (total bar height), comprising ash loss (black), water loss (diagonals), fat loss (white) and protein loss (grey) during the postweaning period, including assimilated fish tissue components. (B) Daily energy use (total bar height), divided into contributions from fat (white: % of total shown on bar) and protein (grey) based on calculated changes in body composition, including fish tissue components. Values are means ± s.e.m. *Control group values that were significantly lower (P<0.05) than those from the Fed animals.

 

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  		Fig. 3. Mean body composition and fuel used by departure in Fed and Control pups, including assimilated fish tissue components. (A) Mass at departure (total bar height), showing ash (black), water (diagonals), fat (white) and protein (grey) and % fat (value shown on bar). (B) Percent of initial protein mass, (C) energy and (D) fat mass used by departure. Values are means ± s.e.m. *Significant difference between groups (P<0.05).

 

Figure 4
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  		Fig. 4. (A) Relationships between protein available at weaning for metabolism and average rate of mass loss (solid squares, solid line) and rate of protein loss (open squares, broken line). (B) Relationship between energy available for metabolism at weaning and daily energy use (open squares, broken line) and daily fat loss (triangles, solid line). (C) Relationship between % contribution of fat to energy use and % fat content at weaning in Control and Low animals.

 




© The Company of Biologists Ltd 2007