ACTA THERIOLOGICA SINICA ›› 2014, Vol. 34 ›› Issue (2): 149-157.
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ZHAO Zhijun, CAO Jing, CHEN Kexin
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赵志军 曹静 陈可新
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Abstract: The present study was aimed at examining seasonal changes in body mass and energy metabolism in small mammals and the physiological mechanisms underpinning the changes. Seasonal changes in body mass,energy budget,masses of tissues and organs and serum leptin levels were determined in striped hamsters (Cricetulus barabensis)that were acclimated to natural temperature and photoperiod for 12 months Basal metabolic rate (BMR)and non-shivering thermogenesis (NST)were measured using a computerized open-flow respirometry system in summer,autumn,spring and winter,respectively. The hamsters showed significant seasonal changes in energy intake and expenditure. Digestive energy intakes were higher by 73.7% ,137.9% and 69.3% in autumn,winter and spring,respectively,than that in summer. BMR and NST increased by 86.2% and 163.6% in winter compared with those in summer. Body mass was constant over the year,but the masses of tissues and organs differed significantly between the four seasons. In detail,masses of liver,heart and kidneys,as well as digestive tracts were heavier in winter than those in summer. Body fat content was significantly lower in winter than in summer, autumn and spring (P < 0.01);it reached a maximum in summer,and a minimum in winter. There were significant changes in serum leptin levels over the four seasons,which were higher by 88.2% and 52.4% in summer than that in autumn and winter,respectively (P < 0.05). It suggested that striped hamsters showed constant body mass over the year,which was inconsistent with the prediction of the ‘set-point’hypothesis. However,body fat content and serum leptin levels were significantly different between the four seasons,providing support for the hypothesis.The increased leptin levels may play a role in the inhibition of energy intake. Serum leptin may be also one of the important factors stimulating metabolic thermogenesis in the winter. Further,the role of leptin in the regulation of energy metabolism and body mass may be different in animals that were acclimated to different seasons.
Key words: Body mass, Energy budget, Leptin, Striped hamster (Cricetulus barabensis), Thermogenesis
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关键词: 体重, 能量收支, 产热, 瘦素, 黑线仓鼠
ZHAO Zhijun, CAO Jing, CHEN Kexin. Seasonal changes in body mass and energy budget in striped hamsters[J]. ACTA THERIOLOGICA SINICA, 2014, 34(2): 149-157.
赵志军 曹静 陈可新. 黑线仓鼠体重和能量代谢的季节性变化[J]. 兽类学报, 2014, 34(2): 149-157.
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https://www.mammal.cn/EN/Y2014/V34/I2/149