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EN
Wild rodents, and especially rats, are significantly more difficult to handle, maintain and breed than laboratory rats and mice. They can be characterized as more skittish, neophobic and aggressive. While establishing a breeding colony of wild Norwegian rats (Rattus norvegicus) I developed some helpful devices and I will describe them here. In this paper I also describe the techniques for transporting animals between their home cages, separating them inside cages, and catching individuals that escape. These devices do not require any home cage modification. They may be modified for size. With size modification these devices may be used for handling animals in any type of laboratory cages. They may be used with all species of small mammals, for example, mice, gerbils, hamster, and opossums. They prove especially helpful when physical contact with humans is a problem (e.g. SPF conditions of breeding, and behavioral procedures that do not allow handling).
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Response to novelty of various types in laboratory rats

51%
EN
One purpose of the two studies reported here was to examine the reactions of rats to changes in the spatial arrangement of a familiarized environment under low stress conditions. The second purpose was to test the role of rats' experience with novelty. In Experiment I the novelty was manipulated by introducing new tunnels into one zone of the experimental chamber. The introduction of novelty took place after 11 habituation sessions. In Experiment II in the course of habituation sessions the experimental group of rats was subjected to a persistent change of tunnel arrangement in the experimental zone, whereas for the control group nothing changed. All animals reacted to the novelty with increased time spent in the experimental zone and decreased time spent in other zones. Both experiments show that under low stress conditions rats demonstrate a positive response toward novelty and that their previous experience with novelty does not affect that reaction.
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