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Suppression of Melatonin Secretion in Île‐de‐France Rams by Different Light Intensities
Author(s) -
Arendt Josephine,
Ravault JeanPaul
Publication year - 1988
Publication title -
journal of pineal research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.881
H-Index - 131
eISSN - 1600-079X
pISSN - 0742-3098
DOI - 10.1111/j.1600-079x.1988.tb00650.x
Subject(s) - melatonin , endocrinology , secretion , white light , medicine , light intensity , darkness , circadian rhythm , fluorescent light , chemistry , biology , fluorescence , optics , physics , botany
The intensity of cool, white, fluorescent light required to suppress melatonin secretion in Île‐de‐France rams was investigated. Animals were conditioned to 12L:12D, lights on 0600 hours, 104 μW/cm 2 (350 lux) at eye level and subjected to a 1‐hour light pulse beginning 3 hours after lights off. Plasma melatonin measurements indicated that secretion was significantly suppressed by 0.30, 7.46, and 26.32 μW/cm 2 (1.02, 25.10, and 88.60 lux, respectively) but not by 0.043 μW/cm 2 (0.15 lux). A clear dose‐response relationship was apparent between light intensity and degree of melatonin suppression.