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Energy Requirements of Nestling Cape Vultures

Joris Komen
The Condor
Vol. 93, No. 1 (Feb., 1991), pp. 153-158
DOI: 10.2307/1368617
Stable URL: http://www.jstor.org/stable/1368617
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Energy Requirements of Nestling Cape Vultures
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Abstract

A continuous feeding trial was used to determine Gross Energy Intake (GEI), Metabolizable Energy (ME) and energy Assimilation Efficiency (AE) during growth of captive (hand-reared) nestling Cape Vultures. The mean ash-free dry energy density of daily samples of excreta for the nestlings was 14.8 ± 0.4 kJ/g (range 14.2-15.9 kJ/g). Nestling GEI increased from shortly after hatching to reach a maximum of 6,443.3 ± 388.9 kJ/day between 80-85 days. After 85 days, GEI decreased to adult levels (range 2,734-3,639 kJ/day) between 105 days and fledging (136 days of age). AE of hand-reared nestlings ranged between 82% and 92%. Mean GEI during the period of maximum growth between 60 and 100 days was 5,459.6 ± 529.8 kJ/day. If deprived of food, a 62-day old nestling with a one kilogram fat reserve (about 15% of body mass) would theoretically deplete this energy reserve in about eight days, if growth continued at a normal rate.

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