Metabolizability and partitioning of energy and protein in green plants by yearling lesser snow geese

The Condor
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Abstract

We measured apparent metabolizability of organic matter, gross energy, nitrogen and cell wall constituents of pelleted alfalfa by Lesser Snow Geese (Chen caerulescens caerulescens. We also used simultaneous measurements of energy expenditure and apparent metabolizable energy intake to estimate heat increment of feeding and net energy for production and maintenance. Apparent metabolizability of energy was 46% as a result of substantial retention of dietary cellulose (45%). Mean slope of the relationship between energy expenditure and apparent metabolizable energy intake, which estimates heat increment at feeding, was 0.33. One minus the slope, 0.67, was our estimate of the proportion of apparent metabolizable energy available for maintenance and production. Resting metabolic rate at zero apparent metabolizable energy intake ranged from 361 kJ· kg-1· day-1 to 432 kJ· kg-1· day-1, while apparent metabolizable energy intake required for energy balance ranged from 455 kJ· kg-1· day-1 to 871 kJ· kg-1· day-1. Lesser Snow Geese (>2 kg mass) were more efficient at retaining dietary energy but possibly lost more of this energy as heat than smaller Black Brant (Branta bernicla nigricans)(∼1 kg mass), suggesting a possible relationship between body size and processing of energy in herbivorous birds.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Metabolizability and partitioning of energy and protein in green plants by yearling lesser snow geese
Series title The Condor
DOI 10.2307/1368989
Volume 97
Issue 1
Year Published 1995
Language English
Publisher Cooper Ornithological Society
Contributing office(s) Alaska Science Center, Alaska Science Center Biology WTEB
Description 7 p.
First page 116
Last page 122
Country Canada, United States
State Alaska, Northwest Territories
Other Geospatial Anderson River, Arctic National Wildlife Refuge, Beaufort Sea coastal plain
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