Ruminants that for any reason are unable to eat enough to survive can be supported via
rumen fistulation. To successfully accomplish this task, an understanding of rumen physiology
is necessary. Some adaptation and modification of the normal physiological
processes will be necessary because the extended time normally required to ingest food
will, for obvious practical reasons, be reduced to a few minutes repeated once to three times
a day. The physiology of significance to aphagic or dysphagic animals is discussed and relevant
examples of clinical cases are used to illustrate practical applications.