The rumen fluid pH values for the three ration groups
(table 7) were between 6.06 and 6.87, which was within the
normal range (5.0 to 7.5) of rumen fluid pH of dairy cows.
However, there were significant differences in rumen fluid
pH among the cows fed different rations (p < 0.05). The pH
of the stalk-based ration A was significantly greater than
that of the silage-based ration C (p < 0.05) due to the fact
that the stalk-based ration contained more crude fiber,
leading to less VFA production. With corn silage as forage,