Starch is the largest constituent in animal diets. The aims of this study were as follows: (a) to assess the variability of basic physicochemical properties and in vitro starch digestion of starchy feedstuffs and investigate relationship between physicochemical properties and starch digestion of the feedstuffs, and (b) to explore the effects of different sources of starchy feedstuffs on starch digestion and glucose release. In this study, we determined the inherent molecular structure and granular structure of starch and chemical compositions of seven starchy feedstuffs, as well as starch digestion in single feedstuff and different feedstuffs combined with corn. Scanning electron microscope (SEM) results revealed significant difference between granule shape and size of starch of different feedstuffs. Fourier transforms infrared (FTIR) spectra for barley and wheat had lower (p < 0.05) absorbance band at areas A_860 and A_928 than other feedstuffs, yet rice starch had the lowest value for ratio (R) (1047/1022). Moreover, digestion rate ranged from 0.0157/min for resistant starch (sorghum) to 0.029/min for rapidly starch (broken rice). The principle component analysis (PCA) showed that predicted glycaemic index (pGI) was positively related to A_1022, glucose and rapidly (RDS) content and negatively related to A_995, A_1047, R (1047/1022), resistant starch (RS) and amylose content. Most of the feedstufss with corn combination had no effect on rate of starch digestion. In addition, different starchy feeds and corn combination changed the rate of starch digestion, when barley, however, sorghum combined with corn seemed to affect rate of starch digestion. To sum up, different sources differed in basic physicochemical and structural properties, which would influence the digestion rate of starch and the release of glucose. Combination of different feedstuffs particular sorghum with corn has interactive effect on starch digestion and the release of glucose.

中文翻译：

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不同植物来源的单一和双重饲料的理化和结构特性对体外淀粉消化和葡萄糖释放动力学的影响

淀粉是动物饮食中最大的成分。本研究的目的如下：(a) 评估含淀粉饲料的基本理化性质和体外淀粉消化的变异性，研究理化性质与饲料淀粉消化之间的关系，以及 (b) 探讨淀粉饲料的影响。不同来源的淀粉饲料对淀粉消化和葡萄糖释放的影响。在本研究中，我们确定了淀粉的固有分子结构和颗粒结构以及七种含淀粉饲料的化学成分，以及单一饲料和不同饲料与玉米结合的淀粉消化情况。扫描电子显微镜（SEM）结果显示，不同饲料的淀粉颗粒形状和大小存在显着差异。p  < 0.05) 区域 A_860 和 A_928 处的吸收带与其他饲料相比，但大米淀粉的比率 (R) 值最低 (1047/1022)。此外，消化率范围从抗性淀粉（高粱）的 0.0157/分钟到快速淀粉（碎米）的 0.029/分钟。主成分分析 (PCA) 显示预测的血糖指数 ( pGI) 与 A_1022、葡萄糖和快速 (RDS) 含量呈正相关，与 A_995、A_1047、R (1047/1022)、抗性淀粉 (RS) 和直链淀粉含量呈负相关。大多数饲料与玉米组合对淀粉消化率没有影响。此外，不同的淀粉饲料和玉米组合改变了淀粉消化率，而大麦、高粱和玉米混合似乎影响了淀粉消化率。综上所述，不同来源的基本理化和结构性质不同，会影响淀粉的消化率和葡萄糖的释放。不同饲料原料特别是高粱与玉米的搭配对淀粉消化和葡萄糖的释放有交互作用。