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Photoperiodic regulation of body mass, food intake, hibernation, and reproduction in intact and castrated male European hamsters,Cricetus cricetus

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Summary

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.

  1. 1.

    Normal hamsters raised in continuous SP or LP apparently did not show signs of rhythmic behavior, except possibly in gonadal activity.

  2. 2.

    Body weight increased continuously, plasma testosterone levels oscillated between 1.5 and 2.5 ng/ml, and animals raised in SP and in cold did not enter hibernation.

  3. 3.

    Similar results were also found in castrated animals kept in SP conditions and cold.

  4. 4.

    The sequence LP-SP induced a decrease in food intake and body weight and a decrease in plasma testosterone levels and triggered entry into hibernation in both intact and castrated animals.

  5. 5.

    After 6 months continuously in SP and with exposure to cold spontaneous recrudescence in food intake and body weight occurred and hibernation ended in both intact and castrated animals.

  6. 6.

    In normal animals a spontaneous increase in plasma testosterone levels was observed.

  7. 7.

    In both normal and gonadectomized animals the phase of refractoriness could be broken by exposure to LP conditions.

  8. 8.

    The critical photoperiod lies between 15 and 15.5 h.

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.

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Abbreviations

LD :

light-dark

LP :

long photoperiod

RIA :

radioimmunoassay

SP :

short photoperiod

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Authors and Affiliations

  1. Institut de Physiologie, CNRS-URA 226, Université Louis-Pasteur, F-67085, Strasbourg, France

    Bernard Canguilhem & Isabelle Bentz

  2. Institut de Chimie Biologique, Faculté de Médecine, CNRS-URA 226, Université Louis-Pasteur, F-67085, Strasbourg, France

    Jean -Paul Vaultier & Geneviève Coumaros

  3. Laboratoire de Zoologie et d'Embryologie Expérimentale, CNRS-URA 226, Université Louis-Pasteur, F-67085, Strasbourg, France

    Paul Pévet & Mireille Masson-Pévet

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  1. Bernard Canguilhem
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  2. Jean -Paul Vaultier
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  3. Paul Pévet
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  4. Geneviève Coumaros
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  5. Mireille Masson-Pévet
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  6. Isabelle Bentz
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Canguilhem, B., Vaultier, J.P., Pévet, P. et al. Photoperiodic regulation of body mass, food intake, hibernation, and reproduction in intact and castrated male European hamsters,Cricetus cricetus . J. Comp. Physiol. 163, 549–557 (1988). https://doi.org/10.1007/BF00604908

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