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Heat Stress and body temperature in brown swiss cows raised in semi-arid climate of Ceará state, Brazil
Leles, Jaqueline Silva; Rodrigues, Inti Campos Salles; Vieira Neto, Maurício Francisco; Viana Neto, Aderson Martins; Rocha, David Ramos da; Costa, Antônio Nelson Lima da; Salles, Maria Gorete Flores; Araújo, Airton Alencar de.
Afiliação
  • Leles, Jaqueline Silva; Universidade Estadual do Ceará. Fortaleza. BR
  • Rodrigues, Inti Campos Salles; Universidade Estadual do Ceará. Fortaleza. BR
  • Vieira Neto, Maurício Francisco; Universidade Estadual do Ceará. Fortaleza. BR
  • Viana Neto, Aderson Martins; Universidade Federal do Ceará. Laboratório de Reprodução Animal. Fortaleza. BR
  • Rocha, David Ramos da; Universidade Federal do Vale do Rio São Francisco. Petrolina. BR
  • Costa, Antônio Nelson Lima da; Universidade Federal do Cariri. Crato. BR
  • Salles, Maria Gorete Flores; Universidade Luso Brasileira. Redenção. BR
  • Araújo, Airton Alencar de; Universidade Estadual do Ceará. Fortaleza. BR
Acta sci. vet. (Impr.) ; 45: 1-8, 2017. tab
Article em En | VETINDEX | ID: biblio-1457649
Biblioteca responsável: BR68.1
Localização: BR68.1
ABSTRACT

Background:

In tropical countries like Brazil, air temperature and relative humidity have a significant effect on animal physiology; there is a great impact of solar radiation on physiological parameters, especially on body temperature. This study evaluated the occurrence of heat stress in Brown Swiss cows in a tropical semi-arid climate, and checked for the correlation between internal body temperatures [rectal temperature (RT) and vaginal temperature (VT)] with surface temperature (ST) to determine if these variables are associated.Materials, Methods &

Results:

Twenty-eight Brown Swiss cows at three stages of the lactation cycle were used in this study 10 nonpregant lactating (NPL) cows, 8 dry pregnant (DP) cows, and 10 pregnant lactating (PL) cows. These animals were between the second and third calving, weighed between 346 and 720 kg, and had ages between 2 and 13 years. During the experimental period, air temperature and relative humidity (RH) at the experimental site were measured using a digital thermohygrometer. The temperature and humidity index (THI) was calculated according to methodology described by Thom (1958), and was used as an environmental comfort parameter. For the evaluation of RT and VT, two digital clinical thermometers, one inserted in the vagina and the other in the rectum, were used simultaneously to minimize stress. Surface temperature (ST) was assessed using a digital infrared laser thermometer at a distance of 50 cm from the animal. Surface temperature was measured in the forehead (FST), thorax (TST), flank (FLST), and legs (LST). During the study period, the ambient temperature (AT) was significantly higher outside (in the sun) than inside of the facilities (in the shade) (P < 0.05). RH was inversely proportional to AT, and was significantly higher inside than outside the facilities (P < 0.05).[...]
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Texto completo: 1 Base de dados: VETINDEX Idioma: En Revista: Acta sci. vet. (Impr.) / Acta sci. vet. (Online) Ano de publicação: 2017 Tipo de documento: Article
Texto completo: 1 Base de dados: VETINDEX Idioma: En Revista: Acta sci. vet. (Impr.) / Acta sci. vet. (Online) Ano de publicação: 2017 Tipo de documento: Article