Melatonin productivity changes a quality of courtship vocalizations in male mice

[Speaker] Matsumoto, Yui K:1,2
[Co-author] Kasahara, Takaoki:3, Okanoya, Kazuo:1
1:The University of Tokyo (Japan), 2:Research Fellow of The Japan Society for The Promotion of Science (DC1) (Japan), 3:Laboratory for Molecular Dynamics of Mental Disorders, RIKEN Brain Science Institute (Japan)

Adult male mice produce a large number of vocalizations in a courtship context. The vocalizations are observed after sexual maturation and affected by castration, suggesting that this behavior depends on sexual maturity. Recently, it was reported that most of the inbred strains of laboratory mice are deficient in melatonin and testis development was significantly promoted in melatonin-deficient mice, suggesting that melatonin promotes early sexual development. We therefore tested the hypothesis that Melatonin productivity affects courtship ultrasonic vocalizations in adult male mice. We recorded courtship vocalizations in male mice that are capable of melatonin synthesis or incapable of that. There were differences between the two groups in the pattern of vocalizations: mice that have melatonin productivity showed a shorter duration of complex syllables than that of melatonin-deficient mice. Results suggest a part of song complexity in laboratory mice may due to an artifact of artificial selection. (Supported by Kakenhi #23118003)
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