Camels are well adapted because they can minimise the stress caused by high temperatures.
When temperatures reach 40C cattle stop eating. Milk production, breeding and movement such as walking to pasture and water are hindered. The loss of appetite may prolong by a year or more the time an animal takes to reach market weight. At high temperatures it may even pant like a sheep. A cow kept for subsistence needs is primarily used for milk which requires considerable quantities of water.