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Pressure Patterns in the Reticulum of the Cow¹

Electrical Engineering Department

L. F. Bush

Animal Science Department, South Dakota State University, Brookings 57006

ABSTRACT

Two mature holstein cows were used to ascertain reticular pressure patterns. A pressure-sensitive transmitter 2.54 cm in diameter and 20.32 cm long was passed down the esophagus to the reticulum. This transmitter sent a variable frequency signal which was decoded to indicate pressures from zero to 175 mm Hg. Continuous pressures were recorded. Rumination and nonrumination pressures were recorded and correlated to different activities such as standing, resting, drinking, and eating. The average length of contraction cycles was 42 sec in nonrumination whereas the average contraction cycle in rumination was 56 sec. Nonrumination patterns exhibited two pressure peaks per cycle whereas rumination had three peaks per cycle. The time interval between the first and second pressure peak of a cycle was approximately 3 sec in both rumination and nonrumination. In rumination the third pressure peak was approximately 3 sec after the second. Contraction pressure magnitudes varied with external activity of the cow. Peaks within each cycle were of different magnitude, usually the first peak was smaller than the secondin nonrumination. During rumination, peak averages were similar for the first two peaks but greater for the third.

¹ Published with approval of the Director as Paper 1088 Journal Series, South Dakota Agricultural Experiment Station, Brookings, South Dakota.

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