Heat stress is widely recognized as a stressful condition that affects physiological, behavioural and hormonal responses of an animal. Animal responses to thermal challenges vary among different species. In dairy calves older than 3 weeks, the thermo-neutral zone is about 5–20°C, but this also varies among individual animals. In the temperature above the neutral zone, homeotherms maintain their body temperature within a relatively narrow range and both physiological and behavioural responses help in thermoregulation (Sanker et al. 2012). At temperatures above the Upper Critical Temperature, cattle sweat in an attempt to dispel the excess heat and the animal becomes heat stressed, which can lead to death of the animal. As cattle sweat at only 10% of the human rate, they are much more susceptible to heat stress (Leonel 2012). InthetropicalclimateofIndia,generallycalvesarehousedin the loose housing system and during the daytime, they are let loose in paddocks without being provided with any shade which leaves them exposed to high environmental temperatures. It has been observed that radiation energy flow to an animal is 685 kcal/m²h, but in reality only 340 kcal/m²h of it is from direct solar radiation; the rest is from reflection of floors, dust, walls and so on (Thomas & Sastry 2007). Placing a