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Transportation of laboratory rodents unavoidably causes stress. Nevertheless, very little is known about the effects of transportation and how long it takes for the animal to recuperate. In the present study, we investigated physiological and behavioral parameters before and after transportation in both transported and nontransported animals. We took blood samples to analyze plasma corticosterone and creatine kinase, and performed physiological measurements by means of telemetry, measuring heart rate, blood pressure, and activity. Behavior was measured by means of home cage observations. This study revealed that plasma corticosterone levels increased at least up to 16 days after transportation, blood pressure and heart rate showed a lasting decrease after transportation, grooming increased, and social interactions and locomotor activity decreased after transportation. With these data we demonstrate that there is a long-lasting effect of transportation on physiological and behavioral parameters. Our results show that the stressful impact of transportation embraces all parts of the procedure, including for example the packing of the animals. Researchers must be aware of this impact and provide a sufficient acclimatization period to allow for the (re-)stabilization of parameters. Insufficient acclimatization periods endanger not only the reliability of research results but also the welfare of the animal used.

The Impact of Transportation on Physiological and Behavioral Parameters in Wistar Rats: Implications for Acclimatization Periods