You are not currently logged in.
Access your personal account or get JSTOR access through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. 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
Vol. 93, No. 1 (Feb., 1991), pp. 153-158
Published by: American Ornithological Society
Stable URL: http://www.jstor.org/stable/1368617
Page Count: 6
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.
Preview not available
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.
The Condor © 1991 Cooper Ornithological Society