Abstract
The author has discussed on the concentration of airborne dust and airborne common (viable) microbes in the dairy barns, and in the rice drying and processing facilities at the previous papers. The present paper is concerned with the same purpose, but on the environmental characteristics of the windowless broiler house.
The results obtained were summarized as follows.
It was recognized that the concentration of airborne microbes and airborne dust had simillar distribution patterns. The number of the microbes which attached to respirable dust was estimated as 8.6×106CFP/mg. The relative ratio of the density of attached microbes was 10.9 for the windowless broiler house, while 1.0 for rice drying and processing facilities, 1.8 for dairy barns, and 2.0 for windowless fattening piggery. The quantity of the dust which accumulated in the broiler house was recognized to have large difference according to the age of broiler chicken, and was infered to relate to the behavior of the birds. The quantity of the accumulated dust was estimated to 1.22g/day/bird, and floating total dust in the air was estimated to 0.68g/day/bird, then total amount was 1.90g/day/bird. In this broiler house which accommodates 10, 000 birds in average, and during 64 days of breeding period, total dust generation was estimated as about 1.22ton, then 1/3 of total dust was accumulated in the house, and residuary 2/3 was exhausted to the outside of the house by ventilation.
