| Autor: |
Canguilhem, Bernard, Vaultier, Jean, Pévet, Paul, Coumaros, Geneviève, Masson-Pévet, Mireille, Bentz, Isabelle |
| Zdroj: |
Journal of Comparative Physiology A: Sensory, Neural & Behavioral Physiology; Oct1988, Vol. 163 Issue 4, p549-557, 9p |
| Abstrakt: |
A group of sexually active male European hamsters were raised either in short-photoperiod conditions (SP; LD 8∶16) or in long-photoperiod conditions (LP; LD 16∶8) from their capture at the end of the hibernation period. Another group of hamsters was castrated in April and gonadectomized animals were maintained in SP and cold (7 °C) or in a succession of SP and LP plus cold. Another group, castrated in May or in September and raised in LP conditions, was transferred in September to SP conditions and cold. These results demonstrate that the European hamster is a photoperiodic species. Three parameters are under the control of the photoperiod: energy balance, hibernation, and gonadal function. These experiments provide evidence that in addition to having a gonadal effect the photoperiod can act directly on unknown cerebral structures involved in body weight regulation and hibernation. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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