Results of Research on the Influence of Winter Weather Conditions on Ammonia Concentration in Barn

During the winter period of research on the cattle farm in the barn with 200 dairy cows of tethered housing with a natural ventilation system, the average values of ammonia concentration were 5-8 mg/m3, which does not exceed MAC 10 mg/m3; while the natural background concentration of ammonia in the area of the farm was 0.57-0.60 mg/m3. Also, significant changes in ammonia concentration in the barn were observed during the day with a difference between day and night up to 2 times. Studies in a barn with 200 tethered dairy cows showed that external weather conditions influenced the redistribution of ammonia emitted over the volume of the room, creating zones of increased and decreased concentration. As a rule, on the windward side of the barn ammonia concentration was 20-50% lower than on the leeward side of the barn; wind intensification contributed to lower ammonia concentration in the barn.