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Testosterone influences hibernation in golden-mantled ground squirrels

KIMBERLY PELZ, PAUL Biology, LICHT, University IRVING ZUCKER of Psychology Integrative of California, Berkeley, California 94720 in goldenmantled ground squirrels. Am. J. Physiol. 259 (Regulatory Integrative Comp. Physiol. 28): R760-R767, 1990.-At different phases of the season, castrated male golden-mantled ground squirrels were implanted with that either were filled with (T) or left empty (blank). Blanktreated animals hibernated normally when housed at 5°C. Entry into was prevented in the majority of squirrels treated with T several days before the initial cold challenge. T concentrations that inhibited torpor (X.2 rig/ml) were comparable with those of intact males at the end of the season. In some squirrels, moderate T concentrations were compatible with , but torpor bout duration was shorter than normal. The inhibitory effect of T on did not appear to require aromatization of T to estradiol. We suggest that a steroid-independent mechanism triggers arousal from that T-dependent processes determine whether is resumed at the end of an arousal period. ING LEE, THERESA M., KIMBERLY PELZ, influences ZUCKER. PAUL LICHT, IRV- body temperature; torpor THE ERA of modern endocrine investigation, reproduction were conceived as mutually antagonistic processes, temporally dissociated in the course of evolution (16). This conjecture was reinforced by http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png AJP - Regulatory, Integrative and Comparative Physiology The American Physiological Society

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