Abstract
The red-toothed shrews (genus Sorex) are one of the smallest mammals. The amount of food they consume a day exceeds their own weight, and without food they can survive for only few hours. Representatives of this genus have extremely high metabolic rates. This study addressed the effect of 8-h fasting and 13-h refeeding on the body weight, blood glucose level, liver glycogen and lipid levels, and relative weight of inguinal and interscapular adipose tissues in the even-toothed shrews (S. isodon). Fasting led to a decrease in the body weight, blood glucose and liver glycogen levels. The relative weight of adipose tissue also decreased, while the liver lipid level increased significantly. After refeeding, blood glucose and liver glycogen levels were considerably higher than in control, while other parameters remained almost the same as in control. Physiological response to fasting develops in S. isodon quite rapidly, promoted by the high metabolic rate.
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