Abstract
Experiments were carried out to elucidate the reduction of contaminating bacteria on the chicken house with washing by jet stream from a sprayer. In Exp. 1, test plates (1×5cm) made with plywood, sheet zinc or slate, were contaminated with 107.6-107.7 per plate of Staphylococcus aureus artificially. Average number of bacteria 104.7-105.3 per plate was detected after washing when nozzle of the sprayer was placed at intervals of 0.5m from the plate with straight angle and the plates were exposed to jet stream during 10 seconds.
In Exp. 2, a chicken house was washed with the jet stream, then sprayed disinfectant solution on the next day. Before washing, 107.2 of bacteria were detected from a floor of the house per 1cm2. After washing, 106.5 of bacteria were still surviving. Reduction of bacterial number by washing was only within 1/10. After spraying disinfectant solution, 105.3/cm2 of bacteria were detected.
