Check the manure system. Urine that is allowed to dry will increase ammonia concentrations. Pit recharge will help to reduce the problem. Solid concrete floors should be kept clean. Poor Dunging Patterns can be caused by cold air dropping into the animal area or improper pen configuration.
Pigs prefer to dung in areas where they are least comfortable.
If cold air is deposited in one location, that is where dunging will occur. In partially slatted buildings, make sure that the slatted area, and the cold airflow exists in the same place. The pen configuration in partially slatted buildings should have solid partitions around the sleeping area and open partitions around the intended dunging area. The waterers should be placed in the dunging area. Pens should have a length to width ratio no greater than 2.5 to 1.