Spring is the season for the recovery of all things, and it is also the season for the rapid reproduction of pathogens.
The prevention and control of biosecurity is relatively difficult.
Affected by the seasonal climate, it is also very difficult to control the small environment in the house. A little carelessness will cause environmental stress and cause diseases.
The management difficulty in spring is the most difficult of the year, and it is also a period of high incidence of disease outbreaks in poultry.
1 —
Climate characteristics in spring
Spring is the period of the year when the weather changes the most, and it is the period when the temperature turns from warm to cold and the fusion of cold and warm;
There is less rainfall outside, forming a small relative humidity; in the period of atmospheric circulation adjustment, there are more windy weather. Therefore, spring has formed the climate characteristics of large temperature difference, small relative humidity and more windy weather.
2 —
smooth transition for spring ventilation
Key control points for spring ventilation:
1、Pay attention to the body temperature of the chickens
2、Maintain normal flock behavior
The main ventilation modes in spring:
The minimum ventilation and transition ventilation are the main ones, supplemented by the longitudinal ventilation; the longitudinal ventilation may be gradually activated at a high frequency in the late spring and early summer.
In spring, the water curtain should be opened carefully.
Especially small day-old flocks should be cautious even when the outside temperature is high.
Because the relative humidity in spring is low, once the water curtain is opened, the temperature of the chicken house will be quickly and greatly lowered, causing severe cold stress to the chickens. So as far as spring is concerned; the key work of ventilation is how to do the minimum ventilation smoothly and gradually convert to transitional ventilation.
key one
The first key is to set a reasonable level temperature difference according to the somatosensory temperature of the chickens. At this time, the key factor to be considered is relative humidity. You cannot just refer to the temperature of the chicken house to set the number of fans turned on, because relative humidity affects the somatosensory temperature. important parameters.
key two
The second key is to keep abreast of the dynamic behavior changes of the flock.
Especially when the outside temperature rises, the ventilation level of the chicken house gradually increases. At this time, the manager needs to observe the behavioral characteristics of the chickens on the spot, and verify the rationality of the temperature difference setting through the behavioral performance. If abnormal behavior is found, the temperature difference or the overall ventilation plan can be adjusted. At this time, managers need to respond quickly, otherwise it will cause serious consequences to the flock.
key three
The third key is to ensure that when entering the transitional ventilation stage, the number of fans turned on should match the size of the ventilation window.
To avoid the phenomenon of a small horse-drawn cart or a large horse with a small cart, it is necessary to gradually increase the number of fans as the outside temperature rises under the premise of ensuring a reasonable negative pressure.
This requires us to pay attention to the opening number and opening size of the ventilation windows, which must match the total exhaust air volume.
key four
The fourth key is to keep a clear head at all times.
Don't be fooled by the illusion of temperature, as long as the flock is comfortable in the minimum ventilation mode, do not artificially switch to transition ventilation.
In the same way, as long as the chickens are comfortable in the transitional ventilation mode, do not artificially switch to tunnel ventilation.
3 —
Common problems with spring ventilation
Question one
There are few air inlets on the side wall, which cannot meet the needs of transitional ventilation. When the temperature rises slightly, the small ventilation window on the side wall will be fully opened.
If the temperature rises further, the number of fans turned on will be increased. At this time, the water curtain guide plate has to be turned on, which has a greater impact on the temperature of the chickens at the front end. Often the front end is prone to problems first.
Question two
Only referring to the increase in temperature in the house, ignoring the relative humidity, it is transformed into a transitional ventilation or longitudinal ventilation mode in advance, resulting in cold stress of the entire flock.
Question three
The degree of automation of the on-site environmental control equipment is low, and the ventilation mode is gradually transitioned by artificial adjustment equipment, which often has a hysteresis.
4 —
Summarize
The transition between spring ventilation modes must be combined with local climatic conditions and chicken flock behavior.
When you can't be very precise about which ventilation mode to implement, the losses from receiving the flock's mild heat are often much less than the losses from making the flock feel cooler.
