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Behavioural Differences in Brown-Norway and Wild-Type Rats Maintained in Standard or Enriched Environment in Response to Novelty in a Familiarised Environment

Maintaining 
animals in an enriched environment may have different effects on animals 
depending on their background. Wild-type rats, such as WWCPS (Warsaw Wild 
Captive Pisula Stryjek) rats, are at an early stage of adaptation to laboratory 
conditions, and we can hypothesise that enriched laboratory environment 
provides them with conditions much closer to a natural habitat than standard 
laboratory cages. The WWCPS rats responded to novelty by orienting their 
behaviour towards the source of change, followed by rapid habituation of that 
response. The laboratory rats responded similarly to WWCPS rats immediately 
after the change, but their increased activity in that section of the 
experimental cage was not subjected to habituation. We propose, that for 
animals at early stages of domestication, information-seeking is more important 
in the regulation of their behaviour than it is for fully domesticated animals. 
In the latter, it is the stimulus-seeking that dominates behaviour regulation. Laboratory rats, and WWCPS rats showed 
different profiles of response to maintaining in the enriched laboratory 
conditions.