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dc.contributor.authorDaltro, Darlene dos Santospt_BR
dc.contributor.authorFischer, Vivianpt_BR
dc.contributor.authorAlfonzo, Evelyn Priscila Münchenpt_BR
dc.contributor.authorDalcin, Vanessa Calderaropt_BR
dc.contributor.authorStumpf, Marcelo Tempelpt_BR
dc.contributor.authorKolling, Giovani Jacobpt_BR
dc.contributor.authorSilva, Marcos Vinicius Gualberto Barbosapt_BR
dc.contributor.authorPimentel, Concepta Margaret McManuspt_BR
dc.date.accessioned2018-11-30T02:42:54Zpt_BR
dc.date.issued2017pt_BR
dc.identifier.issn1516-3598pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/185287pt_BR
dc.description.abstractThe objective of this study was to determine whether infrared thermography is a useful tool for the recognition of dairy cows in a state of thermal heat stress, as well as to identify the best region of the animal to be evaluated for this recognition. Physiological variables, including rectal temperature, respiratory frequency, cardiac frequency, and panting score were recorded in 38 lactating cows. For the assessment of environmental parameters, a digital black globe thermometer (TGD-200 model) was used. Thermographic photographs of different regions of the body of cows were taken using an infrared camera (FLIR® System T300) and indicated respective superficial temperature. Physiological variables and superficial body temperature in different regions varied between genetic groups (Girolando: ½ Holstein × ½ Gir and ¾ Holstein × ¼ Gir; purebred Holstein). The environmental temperature ranged from 20.7 to 37.9 °C with a relative humidity reaching 95%. The mean rectal temperature (40.84 °C), respiratory frequency (111.36 breaths/min), and cardiac frequency (99.22 beats/min) were higher for pure Holstein than for Girolando cows. Positive correlations were found between the physiological parameters and thermographic measures. The highest positive correlation (0.74) was found between the temperature in the lateral region of the udder and rectal temperature. Thermography is a good indicator of thermal comfort. The best region to identify heat stress in cows using thermography is the lateral region of the udder.en
dc.format.mimetypeapplication/pdfpt_BR
dc.language.isoengpt_BR
dc.relation.ispartofRevista brasileira de zootecnia. Viçosa, MG. Vol. 46, n. 5 (maio 2017), p. 374-383pt_BR
dc.rightsOpen Accessen
dc.subjectAnimal welfareen
dc.subjectGado leiteiropt_BR
dc.subjectBem-estar animalpt_BR
dc.subjectDairy cattleen
dc.subjectThermal comforten
dc.subjectCondição ambientalpt_BR
dc.subjectThermographic imagesen
dc.titleInfrared thermography as a method for evaluating the heat tolerance in dairy cowspt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb001081598pt_BR
dc.type.originNacionalpt_BR


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