Changes in aggressive behavior, thermoregulation, and endocrine responses in BALB/cLac and C57Bl/6J mice under cold exposure.

Effect of cold exposure on aggressive behavior, on the concentrations of testosterone and glucocorticoids, as well as on the oxygen consumption at different ambient temperatures, and calorigenic effect of noradrenaline have been studied in BALB/cLac and C57Bl/6J males. Under normal temperature conditions, there have been no significant interstrain differences. After cold exposure (5 weeks at 6-8 degrees C), C57Bl/6J mice exhibited more pronounced adaptive changes in thermoregulation and endocrine status (increase of glucocorticoids and decrease of testosterone concentrations were less expressed in C57Bl/6J than in BALB/cLac). At the same time, males of this strain demonstrated more intensive aggression than BALB/cLac mice. Some relations between physiological and behavioral changes caused by cold exposure are discussed.

[Characteristics of specific adaptation to cold and their relation to aggressive behavior and the stress level in house mice]. / Osobennosti spetsificheskoi adaptatsii k kholodu i ikh sviaz' s agressivnym povedeniem i urovnem stressa u domovykh myshei.

Change of calorigenic effect of noradrenaline after 5 week cold exposition (at 6-8 degrees C) as a criteria of specific adaptation was used. Individual differences of calorigenic reaction after cold exposition were negative correlation with blood corticosterone and positive correlation with aggressiveness in dyadic test.