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Ventilation in winter and early spring Purpose: To provide oxygen for broilers; reduce humidity (after brooding for 7 days) and reduce dust; reduce the concentration of harmful gases; discharge excess heat.
15 days ago, insulation was the main method (a long ventilation pipe was opened in 4 days and the number of long ventilation pipes was gradually increased; the number of other long and short ventilation pipes was gradually increased in 15-30 days, and the number of ventilation fans and the ventilation time were gradually increased; 30 Ventilation is the main reason after days. When ventilation and insulation are contradictory, ventilation is the main method, and the temperature is taken as the lower limit of heat preservation (even distribution of broilers, no entanglements for broilers to meet the temperature).
The 1-15 day brooding temperature has a small fluctuation range. The key to ventilating with a ventilator is not to blow the chicken directly with cold air. In the winter and early spring, the ventilation of broilers must master the wind speed and negative pressure of the ventilation pipes. Note: When the temperature inside the house is low, reduce the amount of air entering the ventilation pipe or reduce the number of ventilation pipes there. Where the temperature is high, increase the air intake or increase the number of ventilation pipes.
Checking the house's confinement: The better the confinement of the house, the better the ventilation effect.
Negative pressure management of chicken houses: 13-meter-wide chicken house, negative pressure value of 20-25 Pa during brooding. The negative pressure value for the 30 days until the slaughter is 10-15 Pa. The negative pressure during the entire feeding cycle should be as low as normal. (especially important for late feeding).
The management of PVC ventilation pipe: The ventilation pipe must be matched with the size and quantity of the fan to avoid excessive negative pressure, resulting in lack of oxygen in broilers in the house. The main performance is that the house temperature is not high. Under normal circumstances, there are still some broilers It is not the high temperature, but the negative pressure inside the chicken house and the broiler's mouth opening.
The details to pay attention to in the ventilation process:
1. Ventilation with ventilation pipes, check whether there is a leak in the chicken house; the water curtain should be tightly sealed; the windows should be tightly sealed; the wall should be free from air leakage and the gap between the chickens should be directly blown; the large exhaust fan should be sealed with plastic cloth; The tube is inclined upwards, preferably the end outlet surface is raked into a 45 degree angle; 1-30 days behind the house must have two layers of plastic cloth to block, and the plastic cloth is left and right and the wall body, and the plastic fabric is sealed well with the chicken frame.
2. The diameter of the ventilation pipe is preferably over 20 centimeters. It is installed one every 2-3 meters away. The hole is located 50 centimeters above the edge of the grid, and the wall is interleaved in the order of 1 m, 2 m, and 3 m. The opposite wall is installed in a staggered order of 3 meters, 2 meters, and 1 meter.
3. The cold air in the ventilation pipe must be mixed with the hot air above the chicken house and then slowly dropped. The temperature of the air that comes into contact with the chicken should meet the normal temperature required at the age, and should not be lower than the normal temperature required for the age. Avoid cold wind blowing chicken and cause cold stress.
4. According to the temperature in the house and the number of fans to determine the number of ventilation pipe opening, to open the long ventilation pipe and then open the short pipe order. According to the gradual increase in the weight of broilers, they should be turned on in order.
5. When blowing strong winds, pay attention to close all or most of the windward PVC ventilation pipe.
Ventilation Ventilation Needed Effect Assessment: Sensory judgement The air in the house is fresh, not boring, non-compressing, little or no ammonia odor; there is little dust in the house, no spider webs; under the ventilator, with the back of the hand or with an arm rest on the chicken frame The feeling is not cold, no cold wind above the broiler chicken group, the temperature is reasonable, no cold stress as the standard.
With regard to the rational and scientific use of PVC ventilation ducts and exhaust fans, farmers need to find a suitable method for their own chicken houses. Some of the ventilation according to the minimum ventilation; some according to the set minimum temperature control exhaust fan to open and close the ventilation; some PVC ventilation pipe with the side fan to ventilate; some PVC ventilation pipe with a vertical fan to ventilate; some to The above methods combine ventilation; other methods. Any broiler can be slaughtered at normal age, and the method of feeding meat within a reasonable range is feasible.
How to scientifically apply PVC vent pipe ventilation in broiler houses
In a broiler house with a PVC vent pipe, it is important to apply a ventilation pipe rationally and scientifically.