Interspecific variation in sugar and amino acid transport by the avian cecum.
Interspecific variation in sugar and amino acid transport by the avian cecum.
复制标题
鸟类盲肠糖和氨基酸运输的种间变异。
DOI：
10.1002/jez.1402520519
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
Diamond,JM
中科院分区：
文献类型：
--
作者：
Obst,BS;Diamond,JM
以前对家鸡盲肠糖和氨基酸运输的研究导致了一个普遍的结论，即禽类盲肠作为营养物质运输的场所并不重要。事实上，我们发现在一些鸟类中，盲肠对己糖和氨基酸的吸收能力是相当大的。盲肠葡萄糖转运在所有五种研究物种(加拿大鹅、鼠尾鸡、家鸡、红颈鸡和岩鸽)中都可以测量到，接近或超过松鸡和岩鸽的肠道水平，占整个肠道综合吸收能力的0.1%(岩鸽)到49%(鼠尾鸡)。在所有物种中，除鹅外，盲肠近端的Pro摄取量平均高于小肠的任何区域。Ceca贡献了肠道对Pro的整体摄取能力的2%(岩鸽)到25%(鼠尾松鸡)。果糖、赖氨酸、亮氨酸和天冬氨酸的含量范围相似。今后应该进行研究，以寻找盲肠运输种间差异的系统发育和生态相关性，并确定营养物质运输如何与鸟类盲肠的其他功能相结合。
Previous studies of cecal sugar and amino acid transport in the domestic chicken led to a widely held generalization that the avian cecum is unimportant as a site of nutrient transport. In fact, we found that the uptake capacity of the cecum for hexose sugars and amino acids is substantial in some species of birds. Cecal transport of glucose was measurable in all five study species (Canada goose, sage grouse, domestic chicken, red‐necked phalarope, and rock dove), approached or exceeded intestinal levels in the grouse and phalarope, and accounted for between 0.1% (rock dove) and 49% (sage grouse) of the whole gut's integrated uptake capacity. Proline uptake averaged higher in the proximal portion of the cecum than in any region of the small intestine for all species but the goose. The ceca contributed between 2% (rock dove) and 25% (sage grouse) of the gut's integrated uptake capacity for proline. Similar ranges were found for fructose, lysine, leucine, and aspartate. Future studies should be undertaken to search for phylogenetic and ecological correlates of the interspecific variation in cecal transport and to determine how nutrient transport integrates with other functions of the avian cecum.