Abstract
The present study was conducted to determine the number of bacteria adherent to various spots (doorway, disinfection tank, walking passage, window, ceiling, floor, manger, water-cup and paddock) of the sheds for breeding and growing-finishing pigs in our experimental farm. The following results could be obtained.
1) More adherent bacteria tended to be detected in the sheds for growing-finishing pigs than in the sheds for pigs used for breeding.
2) The largest number of adherent bacteria was detected on the floor of the pigpens, followed by those of doorway, manger, and water-cup in this decreasing order.
3) The number of adherent bacteria increased under the conditions of over a temperature of 20°C, humidity of over 70%, carbon dioxide concentration of over 0.1% and ammonia gas concentration over 10ppm.
4) A number of bacteria were detected at all times in the floor of pigpens, manger, and water-cups almost irrespective of the environmental conditions in the swine sheds.
5) Bacilli were found to be present in a large number in doorway, disinfection tank, manger and water-cups, while many cocci were detected in the ceiling and floor.
