Influence of daylength on male hamster sexual behavior: Masking effects of testosterone
| Autor: | Honathan D. Karp, Marcie W. Pospichal, J.Bradley Powers |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
Male
endocrine system medicine.medical_specialty Light Hamster Experimental and Cognitive Psychology Biology Sexual Behavior Animal Behavioral Neuroscience chemistry.chemical_compound Group differences Cricetinae Internal medicine Copulation medicine Animals Ejaculation Testosterone reproductive and urinary physiology photoperiodism food and beverages Testosterone (patch) Circadian Rhythm Castration Endocrinology chemistry Sexual behavior biological sciences Seasons Arousal Orchiectomy hormones hormone substitutes and hormone antagonists Gonadal hormones |
| Zdroj: | Physiology & Behavior. 49:417-422 |
| ISSN: | 0031-9384 |
| DOI: | 10.1016/0031-9384(91)90258-p |
| Popis: | Exposure of male hamsters to short photoperiods for 6–8 weeks causes deficits in sexual behavior with receptive females. The present experiment tested the hypothesis that short photoperiodic effects on behavior could be masked in the presence of chronic and stable levels of testosterone. Males were castrated and administered Silastic capsules of testosterone while housed in long (16L:8D) or short (8L:16D) photoperiodic conditions for 7 weeks. Sexual behavior tests at this time indicated that the short photoperiod males copulated less well, but group differences were not robust. Testosterone capsules were then removed and half the animals in both 16L:8D and 8L:16D were transferred to the opposite photoperiod. Sexual behavior was tested 18 days later as the effects of this functional castration developed. These tests indicated that photoperiodic effects were much more obvious in the absence of testosterone than they were during week 7 tests when testosterone was still present. The behavior of the males that were transferred from one photoperiod to the other demonstrated that exposure to the short photoperiod for only 18 days was not sufficient to generate short photoperiod-like sexual behavior deficits. In contrast, exposure to the long photoperiod for 18 days was sufficient to reverse short photoperiodic effects that had already developed. |
| Databáze: | OpenAIRE |
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