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Recording Uterine Activity by Radio Telemetry Techniques

Animal and Dairy Science Department University of Vermont Agricultural Experiment Station, Burlington

ABSTRACT

Measurement of uterine activity in the normal active cow is very difficult. Also, neither isolated muscle preparations nor an intact muscle with wires leading to instruments can adequately demonstrate normal activity of the muscle. This investigation was undertaken to determine if radio telemetry and the proper transmitter could be used to study uterine myometrium. The basic design of radio telemetry techniques has been described by Dracy and Jahn (1).

Both nonpregnant and pregnant animals were used in these experiments. The nonpregnant animal wTas kept in a stanchion with the receiving antenna brought close to her body. The pregnant cow was housed in a 10- by 16-ft wood box stall. (Metal stalls have a tendency to shield accurate transmission.)

The transmitters were built at the College of Technology, University of Vermont. These 1- by 3- by -in. units were cased in glass and coated with tygon plastic to make them waterproof and nontissue-reactive.

¹ Present address: South Dakota State University, Brookings, South Dakota.

² College of Technology, University of Vermont, Burlington, Vermont.