Abstract In this study, the effect of four corn processing methods including grinding (G), dry-rolling (DR), steam-flaking (SF) and super-conditioning (SC), on corn starch parameters viz. gelatinization, granule structure alternation, rumen kinetic dynamics and the extent and site of starch digestion were compared. In addition, physical properties, chemical composition, gas production (GP), pH, ammonia nitrogen (NH3-N) and volatile fatty acids (VFAs) of batch culture after 24 h were determined. The apparent density of the SC corn resembled that of the G corn (0.758 vs 0.837 kg/L); however, its geometric mean of particle size (3.39 mm) was greater than that of the G corn (1.56 mm) and smaller than that of the SF corn (5.43 mm). In addition, dry matter (DM), ether extract (EE) and neutral detergent fiber (aNDF) were not significantly affected (P > 0.01) by the processing method. The starch content of the SC and SF corns were greater (P 0.01). The pH and NH3-N of batch culture after 24-h were significantly lower (P 0.01), the effective rumen degradability of starch (ERDS) and the effective rumen degradability of protein (ERDCP) were found to be greater in the SC corn than in other processing methods (P

中文翻译：

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不同玉米加工方式对淀粉糊化、颗粒结构改变、瘤胃动力学和淀粉消化的影响

摘要 在这项研究中，四种玉米加工方法，包括研磨 (G)、干轧 (DR)、蒸汽压片 (SF) 和超调质 (SC) 对玉米淀粉参数的影响，即。比较了糊化、颗粒结构改变、瘤胃动力学以及淀粉消化的程度和部位。此外，还测定了分批培养 24 小时后的物理特性、化学成分、产气量 (GP)、pH、氨氮 (NH3-N) 和挥发性脂肪酸 (VFA)。SC 玉米的表观密度与 G 玉米相似（0.758 对 0.837 kg/L）；然而，其粒径几何平均值（3.39 mm）大于 G 玉米（1.56 mm），小于 SF 玉米（5.43 mm）。此外，干物质（DM）、醚提取物（EE）和中性洗涤纤维（aNDF）没有受到显着影响（P > 0.01) 处理方法。SC和SF玉米的淀粉含量更高（P<0.01）。分批培养 24 小时后的 pH 和 NH3-N 显着降低（P < 0.01），发现 SC 玉米的淀粉有效瘤胃降解率（ERDS）和蛋白质有效瘤胃降解率（ERDCP）高于 SC 玉米。在其他加工方法中（P