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Warsaw Wild Captive Pisula Stryjek rats (WWCPS) - Establishing a breeding colony of Norway Rat in captivity

100%
Stryjek R., Pisula W.
Polish Psychological Bulletin
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2008
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vol. 39
|
issue 2
66-70
EN
It is believed that the history of laboratory rat dates back to 1820-ies, which is about 300 generations. This relatively short evolutionary distance, drastically different environment and selective breeding could have caused differences in behaviour between the laboratory rat and his wild counterpart - Norway rat (Rattus norvegicus). The vast majority of research concerning differences between wild and laboratory rats was conducted over 30 years ago. The knowledge acquired as a result of that research seems far from being complete. Over a quarter of a century could have deepened the described differences. Nowadays the change in experimental approach, in favour of low stress conditions, can give a new insight into this problem. This article describes process of establishing a laboratory line of wild Norway rat, which will take part in a broad series of comparative studies. 16 wild rats were trapped in 5 distant parts of Warsaw. Most of wild rats successfully adapted to captive conditions, mating successfully and producing litters, which have survived to adolescence.
2

Response to novelty in rats tested in isolation and in pairs: focus on exploration and play

100%
Tanas L., Stryjek R.
Polish Psychological Bulletin
|
2008
|
vol. 39
|
issue 2
81-88
EN
The main goal of the study was to compare investigatory responses towards novelty in 20 Wistar rats divided into two experimental groups (solitary exploration vs. exploration in pairs). Additionally, relationship between novelty and social play/interaction was analyzed in the dyad group. Procedure involved placing animals in an experimental chamber during fifteen, six minute trials on successive days of the study. On the eleventh session a new object was introduced. The results are summarized within several behavioral categories. Investigatory responses of rats in dyad to novel object in familiar environment were not quantitatively different, than those of isolated animals. The animals from both groups responded to the novel object by focusing their exploratory activity on the source of new stimulation. Amount of social play and social exploration was influenced by the experimental manipulation with important sex differences present.
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