【摘要】 以3头安装永久性瘤胃瘘管的泌乳前期荷斯坦奶牛为试验动物,在精粗比为55∶45的日粮条件下,采用In sacco法测定了不同温度和时间烘烤加工处理的玉米在奶牛瘤胃内干物质和淀粉的降解规律。结果表明,玉米经过不同温度和时间的烘烤处理,干物质和淀粉的瘤胃降解率都有不同程度的降低,随着温度逐渐升高、作用时间逐渐延长,干物质和淀粉的降解率也逐渐降低。在所有处理组中,140℃35 min处理组可以明显降低玉米的瘤胃淀粉降解率(P<0.05),比未处理玉米组降低了15.26%。淀粉在瘤胃中降解的影响因素最主要的是淀粉的快速可溶部分和降解速率。更多还原

【Abstract】 In order to investigate the in sacco dry matter(DM),starch degradability of toasted corns processed with different temperatures and times,3 health Chinese Holstein lactating cows with permanent ruminal cannulas were selected as experimental animals fed with the diet of concentration forage ratio 55∶45.The result showed that the ruminal degradabilities of toasted corn DM and starch decreased significantly(P<0.05).Especially the ruminal corn DM and starch degradabilities decreased gradually as the toasting temperature rose and toasting times prolonged respectively.Among all treated groups,the ruminal degradabilities of toasted corn starch for group treated with 140 ℃ 35 min were the lowest,decreased 15.26% compared to control group.The key factors affecting ruminal degradabilities of toasted corn starch were the rapid degrading fractions in toasted corn starch and the degradation rate.更多还原