Elimination of dust production from stables for dairy cows
J. Dolejš, O. Mašata, O. Toufarhttps://doi.org/10.17221/3943-CJASCitation:Dolejš J., Mašata O., Toufar O. (2006): Elimination of dust production from stables for dairy cows. Czech J. Anim. Sci., 51: 305-310.
Three experiments with dairy cows were conducted in an air-conditioned stable under controlled conditions. The objective of the study was to determine the effect of the regulated ionic microclimate on the emission of dust particles (aerosol) up to the diameter of 10 μm (PM10). Four dairy cows were housed in common straw-bedded boxes and the stable was equipped with a vacuum ventilation system. To regulate the ionic microclimate, the apparatus Agri 1 000 (maximum voltage 7 kV, current 25 μA) was used. Thus the airborne dust concentration in the stable (42–132 μg/m3) was reduced by 12.7–26.2%. In experiments B and C statistical significance P ≤ 0.05 was reached. The emissive flow from the stable was decreased from 7.41–8.63 mg/h to 5.30–6.55 mg/h per one animal, i.e. by 24.1–31.3%. Owing to ionisation the ratio of n+ to n– ions was changed. A unipolarity coefficient (P) was changed from 1.65–1.93 to 0.82–0.89, i.e. superiority of n– ions.Keywords:
dairy cows; housing; air ionisation; dust emission PM10; ion ratio