Cellular aspects of the regulation of metabolic rate
作者:
B. Löhrke,
M. Derno,
Heide‐Dörte Matthes,
W. Jentsch,
期刊:
Archiv für Tierernaehrung
(Taylor Available online 1998)
卷期:
Volume 51,
issue 2-3
页码: 199-209
ISSN:0003-942X
年代: 1998
DOI:10.1080/17450399809381919
出版商: Taylor & Francis Group
关键词: Metabolic rate;Feeding level;Ambient temperatures;Potassium channels;Sympathetic outflow
数据来源: Taylor
摘要:
Beyond the energy requirement of maintenance, the assimilated energy, occurring in bioproducts, is linearly proportional to the intake of metabolizable energy in non‐underfed conditions. In contrast, resting metabolic rate is differing between individuals within a population of an animal species. As adaptability to changed environmental conditions may play a role, young bulls were exposed to thermoneutral (18°C) and low (4°C) ambient temperatures and were fed at two feeding levels (1.0 and 1.6 times energy requirement in maintenance) to produce metabolic rate differences, using the same animals, metabolic rate was altered by reducing the sympathetic outflow in each case. Expression of sulfonylurea receptors in circulating mononuclear leukocytes and cells from skeletal muscle (m. semitendinosus)was studied by flow cytom‐etry. Changes of metabolic rate at rest corresponded to the portion of cells with sulfonylurea receptors expression. The data from reducing the sympathetic outflow and those from sulfonylurea receptors expression are useful to explain metabolic rate differences among individuals of an animal population.
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