Woodford S T, Murphy M R, Davis C L, Holmes K R
J Dairy Sci. 1984 Oct;67(10):2471-4. doi: 10.3168/jds.S0022-0302(84)81599-4.
Drinking water that does not equilibrate with ruminal fluid, i.e., bypasses the rumen, was studied qualitatively and quantitatively in eight rumen-fistulated lactating Holstein cows. Decreased temperatures in the sulcus omasi and abomasum shortly after initiation of drinking indicated that water had bypassed the rumen. Recovery of a water-soluble marker, included in drinking water offered after water was withheld for 4.5 or 9 h following feeding, was used to estimate ruminal bypass. For respective treatments, 18 and 5% of drinking water was calculated to have bypassed the rumen. Ruminal bypass in lactating cows drinking relatively large amounts of water could affect comparisons of water intake with total ruminal fluid outflow as measured by dilution of a water-soluble marker. Drinking water should not be assumed to equilibrate with ruminal fluid.
在八头安装有瘤胃瘘管的泌乳荷斯坦奶牛中，对未与瘤胃液平衡即绕过瘤胃的饮水进行了定性和定量研究。饮水开始后不久，瘤胃沟和皱胃温度降低，表明水绕过了瘤胃。在喂食后禁水4.5或9小时后提供的饮水中加入一种水溶性标记物，通过该标记物的回收率来估计瘤胃旁路情况。对于各自的处理方式，经计算分别有18%和5%的饮水绕过了瘤胃。在饮用相对大量水的泌乳奶牛中，瘤胃旁路可能会影响通过水溶性标记物稀释来测量的饮水量与瘤胃液总流出量之间的比较。不应假定饮水会与瘤胃液平衡。
