![]() Hence, the system was only capable of measuring HR in animals that showed little or no activity and in the absence of rumen contractions. We have developed a software filter to remove this noise. HR data measured with the new device contained noise caused by reticulum contractions and animal movements that triggered the acceleration sensor in the ruminal unit. ![]() The collar unit decoded and processed signals received from the ruminal unit, measured LA with two different activity sensors and transmitted pulse interval-modulated VHF signals over distances of up to 10 km.ģ. ![]() HR and T b signals were transmitted via short-distance UHF link to a repeater system located in a collar unit. The unit detected HR by the use of an acceleration sensor and also measured T b. ![]() A ruminal transmitter unit was per os placed into the reticulum and therefore located in close proximity to the heart. We have developed a minimally invasive telemetry system for ruminants that is capable of measuring heart rate (HR), body temperature ( T b) and locomotor activity (LA). ![]() Measuring physiological and behavioural parameters in free-ranging animals – and therefore under fully natural conditions – is of general biological concern but difficult to perform.Ģ. ![]()
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