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Telemetry is very important for monitoring physiological functions in awake and freely moving laboratory animals. Although implantable transmitters reduce stress resulting from daily handling and restraint, the procedure requires invasive surgery, which affects behaviour and wellbeing of animals. This aspect is important in cases in which behaviour is used as one of the read-out parameters for studying the progression of a disease and/or the effects of a treatment over time. In mice, implantation of telemetric devices shows changes in body weight, locomotor and eating behaviour, and grooming and immobility activities. In contrast to mice, no specific research has been reported in larger animals. Therefore, effect on motor activity, health status and bodyweight after surgical placement of intra-abdominal transmitter, electroencephalogram (EEG) electrodes and electromyogram (EMG) electrodes in common marmosets (Callithrix jacchus) were assessed. Two behavioural test systems for locomotor function were used: the Hourglass test to measure the time a monkey needs to return to its normal upright position, and the Tower test to measure jumping behaviour. Additionally, health status and bodyweight were monitored daily from 2 weeks pre surgery until 49 days post surgery.

animal biotelemetry

Recovery time after intra-abdominal transmitter placement for telemetric (neuro) physiological measurement in freely moving common marmosets (Callitrix jacchus)