News

    When it comes to livestock production, the health of the animals themselves, and the environmental problems of the sheds must be of the greatest concern. Many owners of animal husbandry are very surprised: "The same livestock, the same shed, the same feed, why our livestock morbidity is higher than others, production capacity is not as good as others?"

    And next, Let us see what are the main reasons? And how to solve them.

 Livestock temperature 

    The enclosure of the shed is better. This ensures the stability of the whole house environment. It will also be due to poor ventilation, leading to the heat in the house is not easy to emit, and then the temperature in the house is too high. Poor closure of the shed, ventilation is very good, but the winter temperature is low, will also lead to the house temperature is too low. The house temperature is too high or too low, will seriously affect the performance of livestock production.

    The air humidity in the house is too high, the airflow speed is too fast, and the illumination is too little, which will lead to the temperature reduction. In turn, the air temperature is also too high, which reduces the productivity of livestock.

 Dust and microbes 

    Due to the excretion of livestock itself, it will lead to the breeding of microorganisms, dust and bacteria. If the air circulation in the house is poor, microbes, dust, bacteria continue to accumulate, it will affect the health of livestock. Such as foot and mouth disease, influenza, panting and so on. This leads directly to reduced productivity and even death of livestock.

 Harmful gas 

    Livestock respiration, excretion and decomposition of organic matter will lead to the appearance of harmful gases. Therefore, there is a great difference in the composition of the air inside and outside the house. Excessive accumulation of harmful gases can also directly affect the health of livestock, resulting in reduced productivity, and even death.

 Now that we know these reasons, how can we solve the above problems? 

    Because the main thing is to improve the air environment in the shed, it is necessary to install ventilation system in the barn, in order to stabilize the air temperature in the barn. Through stable airflow, dust, microbes, bacteria and toxic gases will be brought out of the house, and fresh air outside the house will be introduced to balance the air quality inside the house.

    Taking the pig farm as an example, we put forward the following ventilation methods to improve the air environment and the production capacity of the pig farm by combining various elements such as the season, the difference between male and female pigs and the actual pig farm environment:

 Negative pressure ventilation filtration 

    Negative pressure ventilation is to install the main filter wall at the front end of the cooling water curtain, and install the ceiling filter box on the ceiling ventilation window.

    In winter, fresh air enters the ceiling through the top ventilation window, filters through the ceiling filtration system and enters the pigsty, and exhaust gas is discharged by the fan.

    In summer, fresh air enters the barn only after being filtered by the main filter wall, and exhaust gas is discharged by the fan. There is negative pressure inside the piggery.

◆The negative pressure ventilation filter requires large area, low replacement frequency, low ventilation energy consumption, and strong regional applicability.

 Positive pressure ventilation filtration 

    The main filtration wall is installed in the filtration room. The positive pressure fan is installed in front of the main filter wall. Fresh air enters through the filter screen and enters the main filter wall under the action of the fan.

    In winter, the filtered air enters the ceiling through the ceiling ventilation window and enters the pigsty through the ceiling small window.

    In summer, the filtered air passes through a wet curtain and enters the piggery. Exhaust gases are removed by shutters and the air pressure inside the house is higher than outside.

◆ There is less risk of unfiltered air entering the house, which is the advantage of positive pressure ventilation. But higher fan power is the guarantee of reliable operation of positive pressure ventilation. The selected fan must be able to provide sufficient air volume under high static pressure difference.

 Balanced ventilation or micro-positive pressure ventilation 

    Neutral ventilation is between negative pressure ventilation and positive pressure ventilation, and generally adopts a partial positive pressure way. Mainly used in boar station. Neutral ventilation combines the advantages of positive pressure ventilation and negative pressure ventilation. The front end is positive pressure inlet air and the back end is negative pressure exhaust air, forming an orderly ventilation flow direction. But relatively speaking, the investment is higher, the operating cost is better.

 So, how to choose the appropriate filtration ventilation scheme? 

◆ The choice of filtration ventilation scheme depends on the air cleanliness level L6 or L9 of the pig farm and the location of the pig farm;

    Positive pressure ventilation filtration is the best choice for boar station and SPF breeding farm.Positive pressure ventilation filtration is the best choice for boar station and SPF breeding farm.

    The negative pressure ventilation filtration design is recommended for thermal emergency sensitive areas and pig breeds. Ensure good ventilation effect and low energy consumption to meet the actual production needs.

 There are the following points to pay attention to in the use of air filtration system: 

1) Before the piggery air filtration system is put into use, it is necessary to test the air tightness of the piggery, the installation of the filter and the airflow pattern in winter and summer to ensure the operation effect of the system.

2) If the system of the unit is not used, there should be detailed operation guidance for filter replacement.

3) When to replace the filter is also an issue we need to consider. The best scheme is to decide whether to replace the filter according to the pressure transformation of each layer (positive pressure air filter unit can be realized). However, many systems do not test the static pressure difference, and filters can be used to change according to the cycle.