Elimination of dust production from stables for dairy cows
2006
Dolejs, J.(Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic)) E-mail:[email protected] | Masata, O.(Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic)) | Toufar, O.(Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic))
Three experiments were carried out in order to determine the effect of the regulated ionic microclimate on the emission of dust particles (up to the diameter of 10 microm) in an air conditioned stable for cows. Four dairy cows were housed in straw-bedded boxes in a stable equipped with a vacuum ventilation system. The apparatus Agri 1 000 (maximum voltage 7 kV, current 25 microA) was used to regulate the ionic microclimate. Thus the airborne dust concentration in the stable (42-132 microg/m3) was reduced by 12.7-26.2%. The results were statistically significant in 2 out of the 3 experiments. 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 was changed from 1.65-1.93 to 0.82-0.89, i.e. superiority of n- ions.
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