Abstract:Striped hamsters (Cricetulus barabensis), living in a solitary lifestyle in the field, exhibited marked dominant subordinate relationship among individuals, and, for females, the body mass, physiological status and faecal hormones level were related to lifestyle and inter-individual relationships. Total 87 adult female hamsters were captured from cropland of a mountainous area in southwest of Shandong province, and all experimental animals were individually housed in cages for 6 months. Animals were given free access to commercial food pellets and water throughout the holding period. Based on matching in body mass, every two unfamiliar female hamsters were given an encounter within arena for 15 min. The faeces of each experimental hamster were collected every day for 28 consecutive days. In order to determine the dominant-subordinate relationships of animals, aggressive behavior, defense, social behaviors and nonsocial behaviors among individuals were quantified everyday. Thirty three female hamsters were tested, and were then autopsied at the end of investigation, and the physiological and reproductive status was checked. Our results showed that (1) during chronic social conflicts, body mass of dominant female hamsters increased significantly; (2) adrenal gland index of dominants decreased significantly; (3) ovary index did not correlated with adrenal gland index in both dominant and subordinate individuals; (4) the faecal cortisol and estradiol concentrations of female fluctuated significantly with time lapse, but the difference was insignificantly between dominant and subordinate females; (5) the faecal cortisol level correlated positively and significantly with estradiol level of dominant females. Our data implied that repeated encounters did not affect the survival and potential reproduction capabilities of female hamsters, which might be attributed to the solitary lifestyle of this species.