Chemosensory and Neural Influences on Photoperiodic Responsiveness of Laboratory Rats
作者:
Randy J. Nelson,
Alison S. Fleming,
Charles J. Wysocki,
Thomas W. Shinder,
Irving Zucker,
期刊:
Neuroendocrinology
(Karger Available online 1985)
卷期:
Volume 40,
issue 4
页码: 285-290
ISSN:0028-3835
年代: 1985
DOI:10.1159/000124088
出版商: S. Karger AG
关键词: Photoperiodism;Day length;Reproduction;Amygdala;Vomeronasal organ;Zinc sulfate;Olfaction
数据来源: Karger
摘要:
Olfactory bulbectomy unmasks photoperiodic responsiveness in normally nonphotoperiodic rats. We assessed whether the photoperiodic effects of bulbectomy reflect disruption of chemosensory input. At 26–28 days of age, male Sprague-Dawley rats were subjected to removal of their vomeronasal organ (VNO) complex, a sham-VNO ablation or large electrolytic lesions aimed at the pyriform cortex or corticomedial nuclei of the amygdala. Other rats were infused with (1) 7.5% ZnSO4, a treatment that destroys the olfactory neuroepithelium, (2) 0.09% saline, or (3) air in each external nare every 4 days; rats from each treatment condition were assigned either to a long (LD 14:10) or short (LD 8:16) day lighting regimen and were autopsied at 90 days of age. Seminal vesicle and paired testes weights did not differ significantly among long-day groups. Mean seminal vesicle and paired testes weights were decreased only in short-day rats treated with ZnSO4. These results indicate that the VNO does not mediate the effects of photoperiod on rat reproduction. Olfactory information, not transduced by the amygdala, or nonsensory components of the olfactory bulbs appear to mask photoperiodism in intact rat
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