Abstract
The effects of different dust control methods and their combinations were studied in a pig finishing building with two identical rooms: a control room, and a treatment room. The methods involved in the study were addition of animal fat in feed, liquid feeding, spraying with water, and spraying with a mixture of rapeseed oil and water. The last mentioned method was used with and without an animal activity sensor to coordinate the time of spraying with the levels of animal activity. The combined method, spraying an oil-water mixture controlled by the animal activity sensor and adding animal fat to dry feed, reduced the airborne dust concentrations and dust exposures of herdsmen by about 80 and 85%, respectively. The optimum rate of oil spraying was found to be about 3.3 g oil day –1 pig –1 .
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