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Sensors 2015, 15(7), 17258-17273;

Infrared Thermography to Evaluate Heat Tolerance in Different Genetic Groups of Lambs

Faculdade de Agronomia e Medicina Veterinária, Universidade de Brasília, Brasília 70910-900, DF, Brasil
Departamento de Zootecnia, Universidade Federal do Rio Grande do Sul, Porto Alegre 91540-000, Brasil
Instituto Federal de Educação, Ciência e Tecnologia Goiano–Campus Iporá, Iporá 76200-000, Brasil
Escola de Veterinária, Universidade Federal de Goiás, Goiânia, Goiás Paulo 74690-900, Brasil
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M.N. Passaro
Received: 6 March 2015 / Revised: 11 July 2015 / Accepted: 13 July 2015 / Published: 16 July 2015
(This article belongs to the Special Issue Frontiers in Infrared Photodetection)
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Heat stress is considered a limiting factor for sheep production. We used information from physiological characteristics linked to heat tolerance to determine whether infrared thermography temperatures were able to separate groups of animals and determine the most important variables in this differentiation. Forty-eight four-month-old male lambs from eight genetic groups were used. Physiological (rectal temperature–RT, heart rate–HR, respiratory rate–RR) and blood traits, infrared thermography temperatures, heat tolerance indices, body measurements, weight and carcass traits were measured. Statistical analyses included variance, correlations, factor, discrimination and regression. Observing the correlations between physiological characteristics (RT, RR and HR) with temperatures measured by infrared thermography, regions for further studies should include the mean temperature of flank, nose and rump. Results show that there are strong relationships between thermograph measurements and RR, RT and HR in lambs, which are suggested to be directly correlated with heat tolerance capacity of the different genetic groups evaluated in this study. The assessment of body surface temperature measured by the thermograph could be used as a noninvasive tool to assess heat tolerance of the animals. View Full-Text
Keywords: adaptation; naturalized breeds; genetic resources; temperature; tropical adaptation; naturalized breeds; genetic resources; temperature; tropical

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McManus, C.; Bianchini, E.; Paim, T.P.; de Lima, F.G.; Neto, J.B.; Castanheira, M.; Esteves, G.I.F.; Cardoso, C.C.; Dalcin, V.C. Infrared Thermography to Evaluate Heat Tolerance in Different Genetic Groups of Lambs. Sensors 2015, 15, 17258-17273.

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