RESPONSES OF THE GUT TO MODERATE ENERGY DEMANDS IN A SMALL HERBIVORE (MICROTUS-PENNSYLVANICUS)
RESPONSES OF THE GUT TO MODERATE ENERGY DEMANDS IN A SMALL HERBIVORE (MICROTUS-PENNSYLVANICUS)
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DOI：
10.2307/1381905
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发表时间：
1993-02-01
影响因子：
1.7
通讯作者：
BOGUE, BA
中科院分区：
文献类型：
--
作者：
DERTING, TL;BOGUE, BA
本研究的目的是确定在草甸田鼠（Microtus pennaculicus）的能量需求适度增加的肠道代偿反应。能量利用和肠道特征的代谢率升高的田鼠，因此，能量需求升高的田鼠与非升高的能量需求进行比较。食物摄入量增加了40%，增加了能源需求，而周转时间减少了26%。尽管周转时间缩短，消化效率降低4%，但消化能量增加了30%。随着能量需求增加而发生的肠道的主要变化是小肠的湿质量和干质量增加，特别是粘膜层的湿质量和干质量以及盲肠的湿质量和干质量。胃或结肠的质量没有显著变化。与能量需求极端增加的研究相反，任何肠道器官的长度或周长都没有变化。我们建议，适度增加营养利用是通过现有的肠道组织，特别是粘膜组织的增殖，而不产生额外的肠道器官长度的成本。
The objective of this study was to determine compensatory responses of the gut to moderate increases in energy demand in the meadow vole (Microtus pennsylvanicus). Energy utilization and gut characteristics of voles with elevated metabolic rate, and thus, elevated energy demand were compared to those of voles with non-elevated energy demands. Food intake increased by 40% with increased energy demand while turnover time of digesta decreased by 26%. Despite shorter turnover time and a 4% loss of digestive efficiency, digested energy increased by 30%. The major changes of the gut that occurred with elevated energy demand were increases in the wet and dry mass of the small intestine, specifically that of the mucosal layer, and the wet and dry mass of the caecum. There were no significant changes in the mass of the stomach or colon. In contrast to studies with more extreme increases in energy demand, there was no change in the length or circumference of any gut organ. We propose that moderate increases in nutrient utilization are accomplished through proliferation of existing gut tissue, particularly mucosal tissue, without the cost of producing additional length of gut organ.