João Paulo Araújo Fernandes de Queiroz

Cutaneous evaporative thermolysis and hair coat surface temperature of calves evaluated with the aid of a gas analyzer and infrared thermography

Abstract The aim of this study was to assess the cutaneous evaporative thermolysis (CET) of different body regions of calves and its relationship to microclimate and coat surface temperature with the use of a gas analyzer and infrared thermography. Our study addresses two questions: (1) Is CET related to surface temperature and/or ambient temperature? (2) Is CET distributed heterogeneously over the body surface, as observed in adult animals? For the purposes of this study, we used twenty-three confined, crossbred calves (Holstein × Zebu). The microclimate was evaluated for air temperature, relative humidity, wind speed, and black globe temperature. Air temperature was analyzed as temperature classes ( 29 °C). CET was determined using a ventilated capsule coupled to a CO 2 /H 2 O analyzer. Hair coat surface temperature was measured using infrared thermography. We chose the same body regions that were analyzed for CET. Body surface temperature did not differ between the flank and hindquarters, but both these areas differed from the neck, which had the highest mean temperature. CET did not differ between body regions. No statistical difference was found for mean CET between TA classes 29 °C. Under conditions of high temperature and shading, CET is positively related to environmental temperature and is homogeneously distributed over the body surface of calves.

Sensible heat transfer and thermal windows in Dasyprocta leporina (Mammalia, Rodentia)

This study aimed to evaluate the diurnal variation of the sensible heat transfer in red-rumped agoutis (Dasyprocta leporina) bred in captivity in a semi-arid environment. In addition, we seek to id...