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The consequences of group-keeping as a social stressor on the solitary-living golden hamster were studied. Two females at the same stage of the estrous cycle were kept together for 5 weeks. Behavioral observations showed that the dominance structures within groups were unstable. Intensity of aggression was highest at metestrous, whereas the greatest activity was observed during the estrous stage. After 1 week, the body masses of singly kept and group-kept hamsters were different. Five weeks after the onset of the experiment, the body mass of the singly kept hamsters had increased by 3.6%, and that of the group-kept hamsters by 25%. The plasma progesterone level of group-kept females was 60 to 70% higher than that of singly kept females. The absolute masses of the adrenal glands and the ovaries were higher in group-kept females. Nevertheless, the relative masses did not differ. Whereas a significant positive correlation between the weights of both organs and the body mass was observed in singly kept females, in group-kept females such a correlation was only observed between body and ovary weight. Number and size of corpora lutea were enlarged in group-kept individuals, and this seems to be responsible for elevated plasma progesterone titres. These results indicate social stress in group-kept female hamsters.
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| http://dx.doi.org/10.1016/s0031-9384(99)00211-5 | DOI Listing |
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