Kinetics of ruminal degradation of wheat and potato starches in total mixed rations.
Kinetics of ruminal degradation of wheat and potato starches in total mixed rations.
复制标题
总混合日粮中小麦和马铃薯淀粉的瘤胃降解动力学。
DOI：
10.1093/ansci/80.1.235
复制
发表时间：
2002
影响因子：
3.3
通讯作者：
F. Laurent
中科院分区：
文献类型：
--
作者：
V. Monteils;S. Jurjanz;Colin;G. Blanchart;F. Laurent
小麦和马铃薯富含淀粉，但它们的淀粉在瘤胃降解率上有所不同。研究了这两种精料在以草青贮和玉米青贮为基础的全混合日粮中烟碱消失动力学和瘤胃发酵曲线。瘤胃微生物对小麦淀粉的降解速度（34%/h）快于马铃薯淀粉（5%/h）。玉米淀粉降解的差异再次出现在VFA浓度上，主要是在草青贮饲料中。总的瘤胃pH值、总挥发性脂肪酸浓度以及乙酸、丙酸和丁酸的比例在以草青贮为基础的饲粮的动力学（振幅和快速性）中，小麦比马铃薯变化更大。在这些饮食中，小麦的酸中毒风险比土豆高，但VFA浓度也更高。在以玉米青贮饲料为基础的日粮中，这些发酵特征的差异如此之小，以至于在这种情况下，马铃薯可以代替小麦，而不会对消化产生任何影响，也没有酸中毒的风险。
Wheat and potato are rich in starch but their starches differ in their rate of ruminal degradation. Kinetics of in sacco disappearance and profiles of ruminal fermentation were studied for these two concentrates in total mixed rations based on grass silage or corn silage. Wheat starch was more rapidly (34%/h) degraded by rumen microorganisms than potato starch (5%/h). The differences in starch degradation in sacco were found again in the VFA concentrations, mainly in grass silage-based diets. Overall ruminal pH, total VFA concentration, and proportions of acetate, propionate, and butyrate are more variable for wheat during the kinetic (amplitude and quickness) than for potato in grass silage-based diets. In these diets, risks of acidosis were more elevated with wheat than with potato but the VFA concentrations were also higher. These differences of fermentation profile were so reduced in corn silage-based diets that, in this case, wheat can be substituted by potato without any effect on digestion and no risk of acidosis.