Graduate School of Biosphere Science, Hiroshima University, Higashihiroshima, Japan.
Anim Sci J. 2009 Oct;80(5):546-55. doi: 10.1111/j.1740-0929.2009.00661.x.
Four Holstein steers fitted with duodenal cannula were used in a 4 x 4 Latin square design to investigate the effect of the combination of corn silage (CS) and alfalfa hay (AH) in different ratios on the ruminal and intestinal digestion of carbohydrates and feed particle passage rate. Steers were fed mixed diets containing both CS and AH in ratios of 80:20, 60:40, 40:60 and 20:80 on a dry matter basis at 95% of ad libitum feed intake. The increase of AH proportion in diets increased dry matter intake and ruminal digestion of dry matter, non-fiber carbohydrate, neutral and acid detergent fiber linearly. Ruminal digestibility of neutral detergent fiber showed a quadratic response, and total digestibility increased linearly with increasing AH proportion. Digestibility of acid detergent fiber in the rumen was not affected by the dietary treatments, but the total tract digestibility increased as the AH proportion increased. Mean retention time of feed particles in total compartment increased when the AH proportion increased from 20% to 60%, but decreased with further increase of the AH proportion. These results indicate that moderate combinations of CS and AH have an associative effect on ruminal fiber digestion, modifying particle movement in the rumen.
采用 4x4 拉丁方试验设计，选用 4 头安装有十二指肠瘘管的荷斯坦公牛，研究不同玉米青贮（CS）和苜蓿干草（AH）比例组合对碳水化合物瘤胃和肠道消化及饲料颗粒通过速率的影响。试验采用干物质基础上 CS 和 AH 比例分别为 80:20、60:40、40:60 和 20:80 的混合日粮，以 95%的自由采食量进行饲喂。随着日粮中 AH 比例的增加，干物质和中性洗涤纤维（NDF）、非纤维碳水化合物（NFC）、酸性洗涤纤维（ADF）的干物质瘤胃消化率呈线性增加。NDF 瘤胃消化率呈二次曲线反应，总消化率随 AH 比例的增加而线性增加。日粮处理对 ADF 在瘤胃中的消化率没有影响，但随着 AH 比例的增加，ADF 在全肠道中的消化率呈线性增加。当 AH 比例从 20%增加到 60%时，饲料颗粒在总腔室中的平均停留时间增加，但当 AH 比例进一步增加时，停留时间减少。这些结果表明，CS 和 AH 的适度组合对瘤胃纤维消化具有协同作用，改变了颗粒在瘤胃中的运动。
