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An investigation into factors influencing basal eye temperature in the domestic horse (Equus caballus) when measured using infrared thermography in field conditions

Jansson, Anna and Lindgren, Gabriella and Velie, Brandon D. and Solé Berga, Marina (2021). An investigation into factors influencing basal eye temperature in the domestic horse (Equus caballus) when measured using infrared thermography in field conditions. Physiology and Behavior. 228 , 113218
[Research article]

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Abstract

Infrared thermography (IRT) is a popular technology used for the detection of thermal changes given its non-invasive nature and lack of direct contact with the individual. Accordingly, the maximal eye temperature (MaxET) measured with IRT has been extensively applied in equine research. However, there is little information available about the potential limitations of the MaxET in field studies. Thus, the aims of this study were to 1) quantify the individual variation of MaxET in field conditions and the effects of individual, breed, body size (height at withers), eye side, sex and age, 2) determine the effects of environment and operator, and 3) explore the relationship between MaxET and rectal temperature (RT) at rest. To accomplish these aims, 791 MaxET measures from 32 horses were collected in Sweden in five different months and five farms over a period of 12 months. There was an effect of individual on IRT (P < .05) and individual MaxET varied from 29.4 to 37.6 degrees C. IRT was also affected (P < .05) by breed and sex (maximal difference 1.1 degrees C and 0.3 degrees C, respectively) but not by eye side, age and height at withers. There were significant effects of month and farm (maximal differences; 2.4 and 2.3 degrees C, respectively), between outdoor and indoor measurements (0.8 degrees C) and also between operators (0.2 degrees C). There were no correlations between MaxET and RT. These results demonstrate that in horses observed at rest in their home environment, MaxET is affected by endogenous (sex and breed) and environmental factors (farm, location and month of the year) and shows no relationship to RT. We strongly suggest that IRT technology should be used with great caution in field studies and only under conditions where these factors can be accurately accounted for.

Authors/Creators:Jansson, Anna and Lindgren, Gabriella and Velie, Brandon D. and Solé Berga, Marina
Title:An investigation into factors influencing basal eye temperature in the domestic horse (Equus caballus) when measured using infrared thermography in field conditions
Series Name/Journal:Physiology and Behavior
Year of publishing :2021
Volume:228
Article number:113218
Number of Pages:8
Publisher:PERGAMON-ELSEVIER SCIENCE LTD
ISSN:0031-9384
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 403 Veterinary Science > Medical Bioscience
Keywords:Infrared thermography, Eye temperature, Horse, Environmental factors
URN:NBN:urn:nbn:se:slu:epsilon-p-110266
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-110266
Additional ID:
Type of IDID
DOI10.1016/j.physbeh.2020.113218
Web of Science (WoS)000596850000024
ID Code:21782
Faculty:VH - Faculty of Veterinary Medicine and Animal Science
Department:(VH) > Dept. of Anatomy, Physiology and Biochemistry
(VH) > Dept. of Animal Breeding and Genetics
Deposited By: SLUpub Connector
Deposited On:29 Jan 2021 05:03
Metadata Last Modified:29 Jan 2021 06:01

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