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Physiol Behav

Title:		Changes in olfactory inputs modify the energy balance response to short days in male gray mouse lemurs
Author(s):		Seguy M; Perret M;
Address:		"Departement d'Ecologie et de Gestion de la Biodiversite, CNRS -MNHN 8571, 4 avenue du petit chateau, F-91800 Brunoy, France. maud.seguy@caramail.com"
Journal Title:		Physiol Behav
Year:		2005
Volume:		20041119
Issue:		1
Page Number:		23 - 31
DOI:		10.1016/j.physbeh.2004.10.019
ISSN/ISBN:		0031-9384 (Print) 0031-9384 (Linking)
Abstract:		"The role of olfaction/olfactory cues on photoperiodic responses was assessed in Malagasy primate, the gray mouse lemur. When exposed to short photoperiod (SP), this primate demonstrates rapid changes in energy balance as adaptive anticipatory response for winter survival. To follow early changes induced by SP exposure, body mass, food intake, resting metabolism (RMR) and free thyroxin levels in plasma (T4) were measured in males abruptly transferred to SP: six intact males (controls), eight males that underwent bilateral olfactory removal (BOX) and eight males exposed to male urinary cues (U-exposed). To assess the effect of SP exposure, two other groups were maintained for 6 weeks under LP: six controls and six BOX males. Whereas all studied parameters remained constant in controls and BOX males maintained under LP, exposure to SP led to different responses according to groups. In controls, SP exposure led to a regular increase in body mass and after 4 weeks under SP, plasma T4 levels, food consumption and RMR significantly decreased. Even if BOX males demonstrated hyperphagic patterns regardless of the photoperiod, an increase in body mass was also induced by SP exposure but without changes in RMR or food intake that were body mass-dependent. In U-exposed males, body mass gain was significantly reduced while food intake and RMR remained high. In both BOX and U-exposed males, SP exposure led to a transient but high increase in T4 levels compared to controls. These results suggest that olfaction/olfactory cues may delay the SP-mediated changes in energy balance"
Keywords:		"Adaptation, Physiological Analysis of Variance Animals Behavior, Animal Body Mass Index Cheirogaleidae Eating/physiology/radiation effects Energy Metabolism/drug effects/*physiology Enzyme-Linked Immunosorbent Assay/methods Male Olfactory Bulb/injuries/ph;"
Notes:		"MedlineSeguy, M Perret, M eng Comparative Study 2005/01/12 Physiol Behav. 2005 Jan 31; 84(1):23-31. doi: 10.1016/j.physbeh.2004.10.019. Epub 2004 Nov 19"