In the hot summer months, the ventilation of pig houses is very important. On July 18, 2016, the farmers of the Agricultural Technology Promotion Office of Manchuria came to the pig farmers in the area to publicize the matters to be noted in the ventilation of the pig houses. At present, ventilation methods adopted in most small and medium-sized pig farms can be divided into roof ventilation, horizontal ventilation and vertical ventilation.
Roof ventilation. Roof ventilation refers to the use of mechanical equipment and the difference in density between different gases, so that the air in the pig house flows up and down, so that the exhaust gas in the pig house can be promptly discharged from above the roof. Ventilation on the roof can greatly reduce the exhaust gas concentration in the house, ensure the air in the pig house is fresh, reduce the incidence of respiratory epidemics, etc.; for the piggery with the floor ventilation window and floor drain, the roof ventilation allows fresh cool air outside from the piggery Ventilation windows in the footwell are blown directly into the pig body to take away the heat emitted by the pigs and the discharged exhaust gas, which can play a significant cooling effect, especially after washing the pigsty in the summer. Roof ventilation can choose to open the window on the roof, install a roof with no power fan or roof fan.
Horizontal ventilation. Lateral ventilation is usually natural ventilation or the installation of fans on walls, mainly for ventilation in open and semi-open pig houses. In order to ensure the smooth ventilation of the pig house, full consideration must be given to the site selection, layout and direction of the pig house, and the design of the pig house. It is advisable that the pig house should be oriented perpendicular to the local wind direction so as to maximize the use of lateral ventilation. The laterally ventilated air inlet is generally composed of glass windows and roller shutters. When installing the roller blinds, the roller blinds and the side walls must have an overlap of about 8 cm. This will prevent thieves from entering the windscreen. At the same time, fly screens should be installed inside the roller blinds. Prevent the entry of flies, rats, etc. to ensure bio-safety; the roller blinds are best able to open from the top down, allowing exhaust gas to be discharged from the top of the roller blind, to balance ventilation and insulation.
Vertical ventilation. Longitudinal ventilation usually uses mechanical ventilation. There are two types of vertical ventilation: positive pressure ventilation and negative pressure vertical ventilation. In general, positive pressure longitudinal ventilation is mainly used in poorly sealed pig houses; negative pressure vertical ventilation is used in well-closed pig houses, and air is forcibly drawn out by a fan to form a negative pressure, so that the outside air is exhausted. Under the influence of atmospheric pressure through the inlet inlet.
The harmful components in the air of the pig house mainly include ammonia gas, hydrogen sulfide, carbon dioxide and dust; among them, ammonia gas and hydrogen sulfide have the greatest impact on the pig's production performance and health, and reasonable ventilation is necessary to ensure the normal growth performance of the animal. Control the concentration of these harmful gases so that the air quality of the pig house meets the requirements.
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