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首页> 外文期刊>Journal of Animal and Feed Sciences >A review of starch digestion in the lactating dairy cow and proposals for a mechanistic model:2. Postruminal starch digestion and small intestinal glucose absorption
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A review of starch digestion in the lactating dairy cow and proposals for a mechanistic model:2. Postruminal starch digestion and small intestinal glucose absorption

机译：哺乳期奶牛淀粉消化的研究及其机理模型的建议：2。瘤胃后淀粉消化和小肠葡萄糖吸收

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The objective of this paper is to review the literature concerning postruminal starch digestion and glucose absorption in the lactating dairy cow and to propose the framework for a mechanistic model representing these processes. Postruminal starch digestion is of particular importance where high levels of rumen escape starch flow from the rumen. However, the digestion of starch and absorption of the resulting glucose within the small intestine may be limited by pancreatic sectetion of #alfa#-amylase and the distribution of SGLT1 glucose transporters respectively. During the investigation, use is made of data gathered from both in vivo and in vitro studies concerning mainly lactating dairy cows. The relative importance of ruminal and postruminal starch digestion is discussed along with the significance of dietary starch source and processing method as factors affecting postruminal starch digestion. Postruminal starch digestion and intestinal glucose uptake becomes increasingly important at high starch intakes. Other factors influenceing the nature of starch digestion are also presented in order to allow the interpretation of experimental data and hence the development of a conceptual model of starch digestion. The review subsequuently examines postruminal starch digestion as it is represented in extant models of ruminant digestion and discusses the essential elements of a digestion model that would have the required capability to accurately acount for the fate of rumen escape starch in a range of practical feeding situations. Whilst the digestion of starch within the rumen is well represented in several working models presented in the literature, postruminal starch digestion and glucose uptake has been largely ignored. Finally, a proposed framework is presented as a scheme upon which a future model of starch digestion in the dairy cow may be built.
机译：本文的目的是回顾有关泌乳奶牛瘤胃后淀粉消化和葡萄糖吸收的文献，并提出代表这些过程的机械模型的框架。当高水平的瘤胃使淀粉从瘤胃中逸出时，瘤胃后淀粉的消化尤为重要。然而，淀粉的消化和小肠内所得葡萄糖的吸收可能分别受＃alfa＃-淀粉酶的胰腺分泌和SGLT1葡萄糖转运蛋白分布的限制。在调查过程中，利用了从体内和体外研究中收集的有关主要泌乳奶牛的数据。讨论了瘤胃和瘤胃淀粉消化的相对重要性，以及饮食淀粉来源和加工方法作为影响瘤胃淀粉消化的因素的重要性。在高淀粉摄入量下，瘤胃后淀粉消化和肠道葡萄糖摄取变得越来越重要。还提出了影响淀粉消化性质的其他因素，以便可以解释实验数据，从而开发淀粉消化的概念模型。综述随后考察了反刍动物消化中现有模型中代表的瘤胃淀粉消化，并讨论了消化模型的基本要素，该模型具有在一系列实际喂养情况下准确计算瘤胃逸出淀粉命运的必需能力。虽然瘤胃内淀粉的消化在文献中提出的几种工作模型中得到了很好的体现，但瘤胃后淀粉的消化和葡萄糖的吸收却被大大地忽略了。最后，提出了一个拟议的框架作为方案，可以在此方案上构建奶牛淀粉消化的未来模型。

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