Why is the water temperature in overhead tanks on Pakistani farms (above 30°C) a major cause of feed intake drops in brown layers during summer?

During the peak summer months in Pakistan (especially in districts like Multan, Faisalabad, and Sargodha), ambient temperatures exceed 45°C. Many farms utilize uninsulated, black plastic overhead water tanks that are directly exposed to the sun, raising drinking water temperatures above 35°C to 40°C. Chickens are highly sensitive to water temperature; their thermoneutral preference is between 15°C and 20°C. When water temperatures exceed 30°C, hens drastically reduce their water intake. Since water consumption is directly coupled with feed intake (hens drink roughly twice what they eat), a drop in water consumption instantly slows down gut motility and halts digestion. The bird enters a state of metabolic distress and stops eating feed to prevent the metabolic heat increment associated with digestion. This leads to immediate drops in egg weight, shell thickness, and overall egg production. Insulating water pipes, burying delivery lines, and using water chillers to maintain water at 20°C is critical to sustain feed intake. Farmers can read water management guides in the Poultry Encyclopedia, buy commercial water chillers and insulated tanks on Poultry Plaza, check daily rate margins on Poultry Rates, and list high-yield flocks on Murghi Mandi.