title: Heat Tolerance in Curraleiro Pe-Duro, Pantaneiro and Nelore Cattle Using Thermographic Images.
abstract: The objective of this study was to compare physiological and thermographic responses to heat stress in three breeds of cattle. Fifteen animals of each of the Nelore, Pantaneiro and Curraleiro Pe-Duro breeds, of approximately two years of age, were evaluated. Heart and respiratory rates, rectal and surface temperature of animals as well as soil temperature were recorded at 8:30 and 15:30 on six days. Variance, correlation, principal factors and canonical analyses were carried out. There were significant differences in the rectal temperature, heart and respiratory rate between breeds (p < 0.001). Nelore and Pantaneiro breeds had the highest rectal temperatures and the lowest respiratory rate (p < 0.001). Breed was also significant for surface temperatures (p < 0.05) showing that this factor significantly affected the response of the animal to heat tolerance in different ways. The Curraleiro Pe-Duro breed had the lowest surface temperatures independent of the period evaluated, with fewer animals that suffered with the climatic conditions, so this may be considered the best adapted when heat challenged under the experimental conditions. Thermography data showed a good correlation with the physiological indexes, and body area, neck and rump were the main points.
authors: Department of Animal Sciences, Faculty of Agronomy and Veterinary Medicine, University of Brasilia (UNB), Darcy Ribeiro Campus, 70910-900 Brasilia, DF, Brazil. cajug29@gmail.com.
authors: Caio Cesar
authors: CC
authors: Cardoso
authors: Veterinary and Animal Science School, Federal University of Goias (UFG), Samambaia Campus, 74690-900 Goiânia, Brazil. flaviamedvet@yahoo.com.br.
authors: Flávia Gontijo
authors: FG
authors: Lima
authors: Veterinary and Animal Science School, Federal University of Goias (UFG), Samambaia Campus, 74690-900 Goiânia, Brazil. clorinda@ufg.br.
authors: Maria Clorinda Soares
authors: MC
authors: Fioravanti
authors: Embrapa Gado de Corte, Av. Radio Maia, 830, 79106-550, Campo Grande, Brazil. andrea.egito@embrapa.br.
authors: Andrea Alves do
authors: AA
authors: Egito
authors: Department of Animal Sciences, Faculty of Agronomy and Veterinary Medicine, University of Brasilia (UNB), Darcy Ribeiro Campus, 70910-900 Brasilia, DF, Brazil. flavia_dipaula@yahoo.fr.
authors: Flávia Cristina de Paula E
authors: FC
authors: Silva
authors: Department of Animal Sciences, Faculty of Agronomy and Veterinary Medicine, University of Brasilia (UNB), Darcy Ribeiro Campus, 70910-900 Brasilia, DF, Brazil. c.bergmann@gmail.com.
authors: Candice Bergmann
authors: CB
authors: Tanure
authors: Department of Animal Sciences, Faculty of Agronomy and Veterinary Medicine, University of Brasilia (UNB), Darcy Ribeiro Campus, 70910-900 Brasilia, DF, Brazil. vanessa.peripolli@hotmail.com.
authors: Vanessa
authors: V
authors: Peripolli
authors: Department of Animal Sciences, Faculty of Agronomy and Veterinary Medicine, University of Brasilia (UNB), Darcy Ribeiro Campus, 70910-900 Brasilia, DF, Brazil. concepta@unb.br.
authors: Concepta
authors: C
authors: McManus
keywords: adaptation; adapted breeds; bioclimatology; heat stress; thermography