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Scaling of metabolic rate on body mass in small laboratory mammalsThe scaling of metabolic heat production rate on body mass is investigated for five species of small laboratory mammal in order to define selection of animals of metabolic rates and size range appropriate for the measurement of changes in the scaling relationship upon exposure to weightlessness in Shuttle/Spacelab experiment. Metabolic rates were measured according to oxygen consumption and carbon dioxide production for individual male and female Swiss-Webster mice, Syrian hamsters, Simonsen albino rats, Hartley guinea pigs and New Zealand white rabbits, which range in mass from 0.05 to 5 kg mature body size, at ages of 1, 2, 3, 5, 8, 12, 18 and 24 months. The metabolic intensity, defined as the heat produced per hour per kg body mass, is found to decrease dramatically with age until the animals are 6 to 8 months old, with little or no sex difference. When plotted on a logarithmic graph, the relation of metabolic rate to total body mass is found to obey a power law of index 0.676, which differs significantly from the classical value of 0.75. When the values for the mice are removed, however, an index of 0.749 is obtained. It is thus proposed that six male animals, 8 months of age, of each of the four remaining species be used to study the effects of gravitational loading on the metabolic energy requirements of terrestrial animals.
Document ID
19810063490
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Pace, N.
(California Univ. Berkeley, CA, United States)
Rahlmann, D. F.
(California Univ. Berkeley, CA, United States)
Smith, A. H.
(California, University Berkeley, CA, United States)
Date Acquired
August 11, 2013
Publication Date
July 1, 1980
Subject Category
Life Sciences (General)
Meeting Information
Meeting: International Union of Physiological Sciences
Location: Budapest
Country: Hungary
Start Date: July 13, 1980
End Date: July 19, 1980
Accession Number
81A47894
Funding Number(s)
CONTRACT_GRANT: NSG-7336
Distribution Limits
Public
Copyright
Other

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