Using infrared thermography to detect sick chickens
2017
Suzuki, S. (Iwate University, Morioka (Japan). Faculty of Agriculture, Department of Veterinary Pathology) | Kuramochi, K. | Sasaki, J. | Ochiai, K. | Goryo, M.
There are few reports on methods for early removal of sick chickens based on abnormal body temperature, so we evaluated the possibility of infrared thermography (IRT) for detecting sick chickens. The body-surface temperatures of the head, trunk and legs were measured by IRT in normal broilers and layers inoculated with fowl adenovirus (FAV) or avian pathogenic Escherichia coli (APEC). The highest values obtained were compared with rectal temperatures of these chickens, and its variability was analyzed. In the results, the standard deviation of body-surface temperatures of heads of normal broilers was the lowest at +-0.91 and was more precise than that for trunks and legs. In an experiment using layers inoculated with APEC isolate, 5 of 7 inoculated chickens had elevated rectal temperatures (up to 44.0degC). The elevation of body surface temperatures of head (up to 39.6degC) and trunk (up to 36.1degC) were consistent with that of rectal temperatures, so sick layers with fever could be detected. The Spearman's rank correlation coefficient of rectal temperature and body surface temperatures of trunks was 0.326, so a weak correlation was detected. These results suggest that detection of chickens with experimental APEC may be possible using IRT.
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