Dietary effects on pelage emissivity in mammals: Implications for infrared thermography |
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| Institution: | 1. Research Group for Mathematical and Numerical Analysis of Dynamical Systems, Kaunas University of Technology, Studentu st. 50-146, LT-51368 Kaunas, Lithuania;2. Department of Printing Machines, Vilnius Gediminas Technical University, J. Basanaviciaus st. 28-129, LT-03224 Vilnius, Lithuania;1. Department of Applied Physics, Hebei University of Technology, Tianjin 300401, China;2. Hebei Chemical and Pharmaceutical Vocational Technology College, Shijiazhuang 050026, China;3. Faculty of Science, Tianjin University, Tianjin 300072, China;4. College of Physics Science & Information Engineering, Hebei Normal University, Shijiazhuang 050024, China;1. Naval Medical Research Center, Silver Spring, MD 20910, United States;2. LNC-NINDS Protein/Peptide Sequencing Facility, NINDS, NIH, Bethesda, MD 20892, United States;3. Stroke Branch, NINDS, NIH, Bethesda, MD 20892, United States;4. Department of Pathology, USUHS, Bethesda, MD 20814, United States;1. Department of Physics, Myongji University, Yongin, Gyeonggi-do 449-728, Republic of Korea;2. Department of Chemical Engineering, Myongji University, Yongin, Gyeonggi-do 449-728, Republic of Korea;3. Department of Materials Science and Engineering, Myongji University, Yongin, Gyeonggi-do 449-728, Republic of Korea;1. Laboratoire Traitement du Signal et de l’Image (LTSI), Université de Rennes 1, Campus de Beaulieu, 35042 Rennes cedex, France;2. Inserm, U1099, Université de Rennes 1, Campus de Beaulieu, 35042 Rennes cedex, France;3. LIRMM, Université de Montpellier 2, CNRS, 161, rue Ada, 34095 Montpellier cedex 5, France;4. Departments of Pediatrics and Physiology, Université de Sherbrooke, 3001 12th North Avenue, Sherbrooke (QC), Canada |
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| Abstract: | Infrared thermography is becoming popular to measure animal surface temperature non-invasively. However, its application in quantitative mammal research is restricted by a paucity of pelage emissivity measurements, which are necessary to acquire accurate temperature readings. Furthermore, the factors influencing pelage emissivity remain largely unknown. We therefore examined the putative links between diet (fat content), hair length, hair diameter, and pelage emissivity in laboratory mice. Individuals maintained on high-fat diets had higher pelage emissivity values than those on standard diets, which may be due to fur being oily and/or the fact that the fur clumped together, exposing the skin underneath. Alternatively, the chemical composition of the fur of individuals on a high-fat diet may vary from those on a standard diet. We found no significant relationships between various hair metrics and emissivity. This study highlights that aspects of an animal's life history (e.g. age, sex, diet) may contribute to the emissivity of its pelage. As such, a single emissivity value may be inappropriate for use in infrared thermography across all species or individuals; other aspects of an animal's biology, which may affect emissivity, should also be considered. Best practice should involve measuring emissivity for every individual animal used in thermography studies. |
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| Keywords: | Emissivity Diet Infrared thermography Mammal Pelage |
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