Selection for high and low oxygen consumption‐induced differences in maintenance energy requirements of mice |
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| Authors: | Hongyu Darhan Motoi Kikusato Masaaki Toyomizu Sang‐gun Roh Kazuo Katoh Masahiro Sato Keiichi Suzuki |
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| Affiliation: | 1. Laboratory of Animal Breeding and Genetics, Graduate School of Agricultural Science, Faculty of Agriculture, Tohoku University, Sendai, Japan;2. Laboratory of Animal Nutritional Biochemistry, Graduate School of Agricultural Science, Faculty of Agriculture, Tohoku University, Sendai, Japan;3. Laboratory of Animal physiology, Graduate School of Agricultural Science, Faculty of Agriculture, Tohoku University, Sendai, Japan |
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| Abstract: | Maintenance energy requirements (MER) of mice selected for high (H) or low (L) oxygen consumption (OC) were compared. Forty‐four mice from H and L OC lines were weaned at 3 weeks and divided into four experimental groups: group A were sacrificed at 4 weeks; group B were fed ad libitum, and groups C and D were fed 2.8 and 2.4 g/day, respectively, from 4 to 8 weeks of age. Groups B–D were sacrificed at 8 weeks. Chemical components were estimated for all groups. MER was estimated using a model that partitioned metabolizable energy intake into that used for maintenance, and protein and fat deposition. The feed conversion ratio for the B group was significantly higher in the H than in the L line. Feed intake for metabolic energy content per metabolic body size was significantly also higher in the H line, whereas accumulated energy content per metabolic body size was significantly higher in the L line. MER of the H line was greater than that of the L line (P < 0.10). These results suggest that selection for H or L OC produced differences in chemical components, feed efficiency, and MER between the H and L lines. |
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| Keywords: | maintenance energy requirement mice oxygen consumption selection |
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