Daily Monitor Saturday January 09 2021 Summary He explains that very hot and humid conditions lead to a significant drop in milk production as most cows stop grazing, seek shade, pant and spendmore time at watering points to counteract the heat. Advertisement The impact of heat stress on dairy cows during hot months has been found to have a significant drop in milk production. According to scientists at the National Livestock Resources Research Institute (NaLIRRI) in Nakyesasa, high temperatures and humidity must be controlled. Just like top athletes, cows work best under ideal conditions. Dairy cows and calves prefer a temperature range from 4 to 17°C. Starting at a temperature of 20°C, a relative humidity of 70 per cent and insufficient ventilation inside the shed, cows begin experiencing stress due to excessive heat.