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Effects of reducing photoperiod and temperature on energy metabolism and body composition in Brandt's voles (Lasiopodomys brandtii)

ZHANG Zhiqiang, ZHANG Lina, WANG Dehua   

  • Online:2007-03-17 Published:2008-07-07

渐变的光周期和温度对布氏田鼠能量代谢和身体成分的影响

张志强, 张丽娜, 王德华   

  1. 中国科学院动物研究所,农业虫害鼠害综合治理研究国家重点实验室, 北京

Abstract: In order to explore the adaptive changes in energy metabolism and body composition in response to a gradual reduction in both ambient temperature and photoperiod,male adult Brandt’s voles (Lasiopodomys brandtii) were raised under the conditions of 20℃ and 12L∶12D photoperiod (control group). The treatment group was changed from 20℃ and 16L∶8D photoperiod to 4℃ and 8L∶16D photoperiod (treatment group)over a period of five weeks and then maintained at those conditions for a further 3 weeks. Changes in body mass,resting metabolic rates (RMR),energy intake,and wet and dry mass of organs and tissues were measured at the end of the acclimation. The growth rate of body mass in treatment voles was lower than control. RMR showed no significant differences either within or between groups. No significant differences were detected in dry matter intake,energy intake,and digestible energy intake in treatment voles during the whole acclimation period,while these parameters were significantly reduced within control voles at the end of acclimation,and were significantly lower than those in treatment voles. Small intestine and stomach dry mass,as well as the wet mass of small intestine, heart,lung,liver and kidney,were significantly higher in treatment voles than in controls,but no significant differences were found in the mass of other organs and tissues. These results suggest that reducing body mass and increasing energy
intake, together with adjusting the mass of some organs and tissues,are important physiological changes in Brandt's voles to adapt the changing environmental conditions.

Key words: Body composition, Brandt's vole, Energy metabolism, Photoperiod, Temperature

摘要: 为探讨在同时逐渐缩短光照时间和降低温度的过程中,动物能量代谢水平和身体成分的适应性变化, 我
们以成年雄性布氏田鼠为对象, 测定了温度为20℃ 和光周期为12L:12D (对照组),以及从温度为20℃ 和长光照条件(16L:8D)逐渐转换到温度为4℃ 和短光照条件(8L:16D)的过程中(实验组), 其体重、静止代谢率和能量摄入的变化, 以及经过8 周驯化后身体器官和组织重量的变化。结果发现:实验组动物的体重增长率低于对照组。在驯化期间, 静止代谢率无组内和组间差异。实验组动物的干物质摄入、能量摄入和消化能等组内差异不明显, 但对照组动物在驯化的第8 周显著降低。实验组动物的能量摄入水平在驯化后显著升高;小肠和胃的干重, 以及小肠和心脏等器官的湿重也都显著高于对照组。结果表明,布氏田鼠能够采取降低体重、增加能量摄入和调整体内某些器官和组织重量的方式来适应变化的环境条件。

关键词: 光照周期, 环境温度, 布氏田鼠, 能量代谢, 身体成分