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| Content Provider | Springer Nature Link |
|---|---|
| Author | Chi, Qing Sheng Wang, De Hua |
| Copyright Year | 2010 |
| Abstract | The adjustments in thermal physiology and energetics were investigated in male desert hamsters (Phodopus roborovskii) which were acclimated to 5°C for 4 weeks. Mean core body temperature in cold acclimated animals decreased by 0.21°C compared with controls. Further analysis revealed that the decrease mainly occurred in the scotophase, while in the photophase core body temperature remained constant during the whole cold acclimation. Thermogenic capacity, represented by resting metabolic rate and nonshivering thermogenesis increased in cold acclimated hamsters from initial values of 1.38 ± 0.05 and 5.32 ± 0.30 to 1.77 ± 0.08 and 8.79 ± 0.31 mlO2 g−1 h−1, respectively. After cold acclimation, desert hamsters maintained a relative stable body mass of 21.7 ± 0.1 g very similar to the controls kept at 23°C (21.8 ± 0.1 g). The mean values of food intake and digestible energy (metabolisable energy) in cold acclimated hamsters were 5.3 ± 0.1 g day−1 and 76.3 ± 0.9 kJ day−1 (74.8 ± 0.9), respectively, which were significantly elevated by 76.7 and 80.4% compared to that in control group. The apparent digestibility was 81.0 ± 0.3% in cold acclimated animals which was also higher than the 79.7 ± 0.2% observed in controls. This increase corresponded with adaptive adjustments in morphology of digestive tracts with 20.2 and 36.8% increases in total length and wet mass, respectively. Body fat mass and serum leptin levels in cold acclimated hamsters decreased by 40.7 and 67.1%, respectively. The wheel running turns and the onset of wheel running remained unchanged. Our study indicated that desert hamsters remained very active during cold acclimation and displayed adaptive changes in thermal physiology and energy metabolism, such as enhanced thermogenic and energy processing capacities. |
| Starting Page | 91 |
| Ending Page | 103 |
| Page Count | 13 |
| File Format | |
| ISSN | 01741578 |
| Journal | Journal of Comparative Physiology B |
| Volume Number | 181 |
| Issue Number | 1 |
| e-ISSN | 1432136X |
| Language | English |
| Publisher | Springer-Verlag |
| Publisher Date | 2010-08-17 |
| Publisher Place | Berlin, Heidelberg |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Desert hamster Phodopus roborovskii Resting metabolic rate, RMR Nonshivering thermogenesis, NST Core body temperature Energy intake Wheel running Cold acclimation Animal Physiology Biomedicine general Zoology Human Physiology Biochemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physiology Biochemistry Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Endocrinology |
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