English Views: 44652 Author: Phoenix Publish Time: 2023-05-05 Origin: Phoenix Breeding Equipment
Recently, many managers on the front line of breeding are concerned about the temperature difference in chicken houses:
1. How to solve the large temperature difference between the front and back of my chicken coop?
2. What is the reason for the large temperature difference?
3. What should I do to reduce the temperature difference between front and back? "
Regarding many questions about the temperature difference in the chicken coop, today we will talk about the temperature difference in the chicken coop in summer.
We will communicate from the following aspects:
Should there be a temperature difference in the chicken coop?
What are the main temperature differences in the chicken coop in summer?
What adverse effects will the temperature difference have on the flock?
How to reduce the temperature difference in summer and reduce the adverse effects of temperature difference on chickens?
Whether the chicken house should have temperature difference?
First of all, from the biological point of view of poultry, chickens do not need temperature difference.
It is in the chicken's best interest to grow in a stable environment.
Just like migratory birds, migratory birds will migrate to the environmental area suitable for their survival as the seasons and the external environment change.
Furthermore, the ultimate goal of the environmental control of modern high-density poultry farming is to provide a suitable, stable and continuous growth environment for chickens.
In an ideal state, the air quality in the house is required to be good, the environmental indicators are uniform, and there is no need for temperature difference.
But at present, whether it is the most popular classic ventilation mode in the world, or the precise ventilation mode commonly used in Europe.
It is very difficult, or impossible, to completely achieve no temperature difference in the environment in the house.
The temperature difference can only be infinitely reduced in a specific ventilation mode.
So the understanding in this aspect is: it is not a question of whether there should be a temperature difference in the chicken coop, but how we try our best to reduce the temperature difference by improving management factors is the key.
Exist in summer chicken coop
What are the main temperature differences?
A. Temperature difference between morning and evening;
B. Temperature difference between front and back;
C, the temperature difference between upper and lower;
D. left and right temperature difference
Of course, there are many temperature differences in the chicken coop, such as front-middle temperature difference, middle-back temperature difference, left-middle temperature difference, right-middle temperature difference, intake air temperature difference and so on.
I personally think that the above four types of temperature differences need to be focused on on site. If these four types of temperature differences are well controlled, other temperature differences can be easily resolved.
There is a problem here, that is, all the above-mentioned temperature differences are expressed based on the ambient air temperature sensor. We need to pay more attention to the temperature difference of the somatosensory temperature of the chicken flock. Not all temperature differences will have an adverse effect on the chicken flock.
No matter whether there is a significant temperature difference or not, as long as the somatosensory temperature of the flock maintains a certain degree of consistency within a certain period of time, the flock can fully adapt.
We also don't want to make any link changes.
Of course, we need to enter the chicken house to observe whether the behavior of the flock is active to verify whether our operation is proper.
The temperature difference will affect the flock
What are the adverse effects?
It needs to be emphasized again that the temperature difference here refers to the temperature difference of the body temperature, not the temperature difference of the air temperature.
Of course, there is an inevitable relationship between body temperature and air temperature.
▲ Effect of relative humidity on body temperature
▲ When the outdoor temperature is 32°C, the relationship between different wind speeds and the body temperature of chickens of different ages
What I want to express is that the change of air temperature is not equal to the change of body temperature, but the change of body temperature will be accompanied by the change of air temperature, which will not be explained in detail here.
Going back to the adverse effects of temperature difference on chicken flocks, there are mainly the following adverse effects:
feed rate difference
difference in feed intake
cause a difference in uniformity
Severe cases can cause outbreaks of respiratory or other diseases in chickens
This is also an important reason why the weight of the front and back flocks and the weight of the upper and lower flocks are quite different.
It is also the root cause of local diseases such as respiratory tract first appearing in the chicken house.
How to narrow the temperature difference in summer
Reduce adverse effects?
The measures to reduce the temperature difference between the upper and lower floors are: choose to open a reasonable ventilation fan unit, in principle, first the lower layer and then the upper layer, and first the middle and then both sides.
The measure to reduce the temperature difference between left and right is: set the static pressure in line with the current ventilation mode according to the structure of the chicken house and the feeding mode on site.
The measures to reduce the temperature difference between front and back are: first select the current reasonable ventilation mode, and then match the operation of the environmental control equipment in the chicken house with the current ventilation mode. matches, such as:
1. If the fans are turned on too much, the air inlets are turned on small, or the fans are turned on less, and the ones near the air outlets will cause the air flow in the house to be slower, resulting in a larger temperature difference between the front and back.
2. After entering the vertical ventilation, if the side wall ventilation small windows are still opened, the vertical wind speed in the chicken house will be greatly reduced, resulting in a large front-to-back temperature difference.
3. If the longitudinal fan in the chicken house is not fully turned on, the wet curtain is started to fill water, which will cause a larger temperature difference between the front and rear, because the fastest air circulation rate in the house has not been achieved.
The wet and cold air at the front end cannot be transported to the rear end quickly, and the stress on the front-end chickens is also relatively large. This is also an important reason why improper watering of the wet curtain will cause the front-end chickens to get up early in the respiratory tract.
4. After entering the longitudinal ventilation, the airtight heat preservation of the chicken house is not done thoroughly, and some hot air outside the house enters the chicken house without passing through the cooling curtain, resulting in excessive local temperature difference and even heat stress.
This is the last thing to do, and it is also the easiest factor that has a greater impact on longitudinal ventilation in summer.
5. If all the measures that can be taken have been used, and the temperature difference between the front and rear cannot be well controlled, then the range of the temperature difference between the front and rear should be maintained at this range.
Ensure that the temperature difference of the chicken group's sensed temperature difference in the front and rear areas remains unchanged, and the chicken group can also maintain a relatively stable and healthy state.
Summarize
In the ventilation operation of the chicken house in summer, we don't need to pay too much attention to the temperature change of the air sensor, but need to pay more attention to the change of the chicken group's sense temperature.
No matter whether it is morning or evening, as long as the body temperature of the flock remains within a controllable range within a day, the flock is still ok.
What needs to be reminded is that it is necessary to make reasonable adjustments based on the age of the flock on site and the actual efficiency of equipment operation.
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