In summer, the premise of effective ventilation is to maintain the airtightness and allow fresh air to enter the house from the required place (sidewall vents or wet curtains). Therefore, it is required that the tightness of each house be checked in the field area, especially the entrance of the middle of the house, the place where the faeces are placed, the junction of the wet curtain and the house, and so on. Longitudinal ventilation must ensure that the air should be from both sides of one end of the house and not from one side into the house. The air enters the house from both sides to fully mix the air in the house and there is no dead corner.
Negative pressure management
Only a certain amount of negative pressure can be formed in the shed to ensure that the vents entering the house have a certain wind speed. The lateral ventilation requires a wind speed of 3 to 5 meters per second. The vertical ventilation ventilation curtains pass through the curtain at a speed of 1.5 meters per second. ~ 2 meters, the wind speed of chicken back requires 2 meters to 3 meters per second. The maximum wind speed of the back of the chicken can not exceed 3 meters per second, more than 3 meters, the chicken is prone to adverse symptoms. The negative pressure in the house is generally 0.05 to 0.08, which cannot exceed 0.01 inches of water. The negative pressure in the chicken house should be observed and recorded in the field area to prevent the negative pressure in the house. In addition, the intake pipe connected to the negative pressure controller should not be placed in the working room in the middle of the house. It must be placed outside and connected to atmospheric pressure.
Vent management
If the temperature difference between day and night is too large or the weather changes, it is necessary to use mixed ventilation to ensure the temperature of the house. Therefore, when transitioning from a horizontal vent to a vertical vent, attention must be paid to the management of the air intake. That is, when the fan is switched from one stage to two stages or three stages, the corresponding air inlet must be adjusted to reduce the negative pressure in the house, so that the wind speed in the house is uniform and the temperature is consistent. For example, gradually open the area of ​​the wet curtain, increase the area of ​​the vent, otherwise the negative pressure in the house will be too large, affecting the efficiency of the fan.
When the horizontal ventilation is turned into vertical ventilation, it is recommended that only when the number of fans in the house is greater than half of the total number of fans, if the number of fans is generally greater than or equal to 5, the vertical ventilation should be changed from mixed ventilation to vertical ventilation. Close all side wall vents. Horizontal ventilation is used when one or two fans are turned on in the house, and mixed ventilation is recommended when three to five fans are turned on in the house. What kind of ventilation mode should be used specifically, the field area should be adjusted according to the actual situation to ensure that the chicken house temperature is even.
Effective temperature and body temperature
The flow of air over the birds can produce a convective cooling effect, excluding the normal breathing of the birds and the release of moisture from wheezing. The flow rate through the air throughout the house can have a "wind-cooling effect" on the birds. Whether the ventilation of the coop is effective and whether the chickens are comfortable, you can't just look at the temperature displayed by the thermometer and the thermostat. Be sure to pay attention to the temperature of the chicken. Special Note: The best way to judge whether the environmental strength in a chicken house is appropriate and whether the chickens are healthy and comfortable is to observe the flock, that is, to know the comfort degree of the flock according to whether the flock intake, drinking water, buzzing, and mental status are normal or not. . The temperature sensed by the flock (sensible temperature) is different from the temperature measured by the thermometer. The absolute temperature of the house and the air flow rate, the age of the flock, the sex, and the environmental condition of the house must be taken into consideration. The faster the air flow rate, the greater the gap between the sensory temperature (lower) of the chicken and the recorded value (high) of the thermometer; the smaller the age of the bird, the greater the "air-cooling effect" caused by the wind speed. Therefore, as field management personnel, we must understand what is normal and what is abnormal in our chickens. We must always go into the coop to observe, evaluate, and feel the odor temperature of the coop, especially before and after turning on the lights in the morning. No suitable.
Chicken house temperature setting
It is recommended that the temperature of the house be maintained at 22 °C ~ 24 °C, and when the temperature reaches 32 °C or more, all the fans in the house can start, so the difference between the fans at all levels must be set properly to avoid frequent start of the fan. The temperature probe is placed on the chicken cage 20 cm back. Clean the probe with a dry rag every week to remove dust from the top and ensure that it is sensitive.
Ventilation and cooling equipment maintenance. Regularly maintain and maintain ventilation and cooling equipment in the house to ensure optimal performance. In advance, each fan in the house is allowed to be maintained by power protection company personnel. All of them are connected to the line for debugging. The settings of the fan are required to be automatic and not to be used manually to ensure good use. According to the actual conditions of the site, equipment maintenance plans and procedures are formulated, such as the cleaning of shade hoods, shutters, blades, cleaning of wet curtain pool water, adjustment and replacement of belts, and commissioning and maintenance of generators. Some common accessories to do a proper inventory and so on. There should be more than one spare pump in the summer area in order to allow timely replacement in case of failure.
Wet curtain management
According to the weather conditions in advance repair, install all parts of the wet curtain, such as water pipes, motor pumps, etc., before use wet screen clean, ensure that it can be put into use at any time. It is recommended that when the temperature of the chicken house reaches 30°C or more and the chickens have obvious thermal reactions, the remaining two fans of the house are all started. If the temperature cannot be lowered yet, the wet curtain should be started to cool immediately. In the summer, the outside temperature is not as high as the summer heat, but the temperature in the house has reached 30°C. At this time, a wet curtain should be started and the opening time should be shortened as soon as possible, and several fans should be properly closed to achieve the purpose of cooling. Chickens have less stress. If the fans are all turned on and the wet curtains are turned on again, the temperature inside the house will drop by a large margin, and the stress on the birds will also be great.
When opening the wet curtain, the temperature change should be closely watched. When the temperature drops rapidly, the wet curtain should be closed and the fan should be properly stopped to reduce the temperature. When the temperature of the poultry house drops to 27°C after opening the wet curtain, the wet curtain should be closed, and the temperature should rise to 29°C to 30°C before opening. When the wet curtain and fan are all turned on and the temperature is still above 30°C, new water or ice should be added to the reservoir and mitigated by spray cooling.
Do not open the wet curtain in the morning and evening or when the outside is hot and humid. Normally, it can be opened after 9 am. It is recommended to close it after 5 pm. The wet curtain at the wet place of the coop must be properly sheltered from the cold wind generated by the wet curtain, so as to avoid cold stress in the small flock. When using a wet curtain, check the reservoir regularly to ensure that there is sufficient water to prevent the water pump from burning out the machine.
Regularly check the water circulation system of the wet curtain, especially the outlet of the pipeline above the wet curtain, to ensure that the water flow is evenly distributed over the entire surface of the wet curtain. In order to obtain the best cooling effect, ensure that the wet curtain is completely wetted by water. At the same time, the wet curtain itself needs to be cleaned so that the air can pass smoothly. Therefore, it is required to clean up each air gap as much as possible to prevent clogging. The curtain is started for the first time, the water quality should be cleaned and changed, and disinfectant should be added to the water (but not bromine or chlorine, etc.).
In order to ensure the breathability of the wet curtain, it is necessary to regularly clean the wet curtain to ensure that the wet curtain is clean and free of debris. It is forbidden to place objects such as brooms, iron files on the wet screen so as to avoid damaging the wet curtain. The best way to clean the wet curtain is to flush it with plenty of clean water, but use constant-pressure water instead of high-pressure water gun. Otherwise, the wet curtain will be washed out and the wet curtain can be washed with low-pressure water. The reservoir should be kept clean, supplemented with fresh water, and added to the water to kill bacteria. Above the reservoir must be covered with objects to prevent contamination by chicken feathers.
At night, try to cool down the chickens, accumulate excess heat during the day, and dissipate them at night. You can set the temperature controller to ensure that the fans continue to operate.
Ventilation system assessment
Ventilation system under proper management ensures that the home environment is suitable. If the ventilation system is not managed properly and the ventilation needs of the flock cannot be met, the dirty air will accumulate in the house. These dirty air and its sources of pollution, including ammonia, carbon dioxide, carbon monoxide, and dust, can cause stress and inhibit the performance of chickens. This stress can damage the immune system and increase chicken susceptibility to disease. To reduce the problems caused by dirty air, the ventilation system should be properly managed and the temperature, relative humidity and wind speed should be strictly controlled at an appropriate level.
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