When does the risk of infectious coryza transmission peak in winter housed flocks, and when should air flow be prioritized over temperature preservation?

During the freezing winter months in northern Punjab and Khyber Pakhtunkhwa, farmers often commit the critical error of completely closing house curtains or turning off exhaust fans to conserve warmth. This restricted ventilation traps moisture, respiratory droplets, and toxic ammonia gas, creating an ideal microclimate for the rapid transmission of Infectious Coryza and Mycoplasma. The risk of transmission peaks in mid-winter (December to January). To prevent outbreaks, minimum ventilation air flow must always be prioritized over temperature preservation. Even in cold weather, exhaust fans must run on cycle timers to ensure fresh oxygen intake and exhaust moisture, keeping house relative humidity below 70% and ammonia under 10 ppm. Ventilation management is detailed in the Poultry Encyclopedia, multi-stage environmental climate controllers and variable speed fans are sold on Poultry Plaza, pullet and egg rates are updated daily on Poultry Rates, and winter-hardy layer flocks are listed on Murghi Mandi.