Abstract
1. 1. The in trarumen pressure (IRP) of eight calves was elevated for 10 min by nitrogen insufflation to pressures of 5, 10, 15 and 20 cm H 2O. 2. 2. Rumen motility was evaluated by recording reticulorumen myoelectrical activity and changes in luminal pressure, while eructation was determined from anterior tracheal and face mask gas expulsion. 3. 3. The elevation of IRP increased primary rumen contraction frequency slightly and secondary rumen contraction frequency as much as 3-fold. 4. 4. Rumen gas was expelled only during rumen contractions and virtually always during secondary rumen contractions. 5. 5. Cattle do not exhibit the primary-secondary contraction previously identified in sheep and their rumen motility appears to be less sensitive than sheep to increases in IRP.
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