HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Dracy, A. E. Articles by Essler, W. O. Search for Related Content PubMed Articles by Dracy, A. E. Articles by Essler, W. O.

Some Ruminal Reticular Pressures Recorded by Radio Telemetry

University of Vermont, Burlington

ABSTRACT

Most of the classical means of measuring ruminal pressure have been described by Dukes (2). These included the use of balloons connected to mercury manometers, the use of gauges measuring through rumen punctures, and the use of tympanometers. In 1959, Wallace (4) described a radiosonde for measuring rumen pressures. None of these was precise enough to measure the exact pressure changes over short intervals.

A pressure transducer that is accurate from zero to 250 m.m. Hg pressure, has been designed (H). The mechanical transducer produced an electrical change; of sufficient magnitude to shift the frequency of a radio-sending transmitter. This 1-in. by 3-in. instrument was inserted via the esophagus and allowed to remain in the reticulum. From this location, rumen and reticulum pressures were recorded on a series of normal sheep. The physical arrangement of the receiving equipment has been described (1). Limitation of the pressure endoradiosonde is the range of transmission and long-term calibration.