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Title

Effects of social conditions on adult and subadult female rat-like hamsters (Cricetulus triton).

Authors

Jian-Xu Zhang; Jia Ni; Fu-Yan Wu; Zhi-Bin Zhang

Abstract

As a solitary species, rat-like hamsters (Cricetulus triton) still live in family groups before they become mature and leave their families for a solitary life. This study aimed to investigate by a laboratory experiment if housing conditions have a different effect on physiological aspects of immature and mature females. We found that paired caged adult females became significantly heavier than their original weights; whereas the singly caged did not show significant change in their body weight. Although the subadults’ body weights increased significantly compared to their initial weights in both paired or singly caged groups, significant changes in body weight did not occur between the two groups. Although spleen and adrenal gland sizes were not significantly different between the two adult groups, the cortisol levels were significantly elevated by paired caging. In subadults, the adrenal size of the singly caged group was larger than that in the paired caged group despite there being no significant difference in cortisol level. Flank glands became significantly larger in paired caged adults than in singly caged adults, and there were no significant differences in subadults between the two groups. Additionally, ovaries and uteri of the paired caged adult females were comparatively lighter than those of the singly caged group; in contrast, ovaries and uteri of the paired caged group were larger than those of the singly caged group in subadults, although progesterone and estradiol levels did not show significant differences between the two adult groups. These different changes in physiological traits caused by housing conditions indicated that paired caging depressed adults and facilitated subadults; isolation facilitated adults and depressed subadults.

Subjects

HAMSTERS; HAMSTERS as laboratory animals; LABORATORY animals; ANIMAL experimentation; PHYSIOLOGY; REPRODUCTION; PROGESTERONE; ESTRADIOL

Publication

Journal of Ethology, 2004, Vol 22, Issue 2, p161

ISSN

0289-0771

Publication type

Academic Journal

DOI

10.1007/s10164-004-0117-3

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