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Causes of poultry respiratory tract diseases

 

Chicken respiratory disease is a common type of disease in chicken farms with complex etiologies. There are two types of causes of chicken respiratory diseases, namely infectious and non-infectious. Infectious pathogens include bacteria, viruses, mycoplasma, etc., and non-infectious factors include environmental and management factors. Therefore, in order to prevent and control the respiratory tract, it is necessary to identify the cause and treat it according to the symptom. The following are the main reasons.

First. Damage to the poultry respiratory tract mucosa

When the respiratory mucosa is stimulated by the external adverse environment, it will damage the respiratory mucosa, making it unable to play a normal immune protection function, thereby causing respiratory diseases.

Under normal circumstances, the mucous membrane of the respiratory tract is covered with a layer of pseudostratified ciliated columnar epithelial cells, and the cilia wiggle constantly to put pathogenic microorganisms and dust out of the body and prevent pathogenic bacteria from entering the body.

Therefore, the respiratory mucosa is an important line of defense against the invasion of external pathogenic microorganisms.

Second. Environmental factors that induce poultry respiratory diseases

1. The seasonal climate is changeable, and the temperature difference between day and night is large, which is easy to cause the temperature in the house to fluctuate. Chickens are frequently subjected to environmental stress, resulting in a decline in resistance, which provides favorable conditions for virus invasion.

2. Poor ventilation in the chicken house and high concentrations of toxic and harmful gases in the house, such as high concentrations of ammonia, carbon dioxide, and hydrogen sulfide, can easily lead to disease in the chickens.

3. The sunshine time is long and the temperature is suitable, which is suitable for the growth and reproduction of pathogenic microorganisms in the environment.

4. The air is dry, the humidity in the house is not enough, and the dust droplets fly around, which is easy to damage the respiratory mucosa of chickens.

5.The flocks are not expanded in time, and the stocking density is too high, which can easily lead to the disease of the chickens.

Third . poultry body’s own immune factors

1. Laying hens are recessively infected with viral diseases such as mycoplasma disease or Newcastle disease, H9, mycoplasma, and throat, and when vaccine immunity is not in place, chickens are prone to infection.

2. Vaccination when the flock is in a sub-healthy state can easily cause respiratory diseases. If the treatment is not timely, it is easy to develop colibacillosis and mycoplasma diseases.

3. After the hot summer and long-term egg-laying consumption of laying hens, the flocks begin to have varying degrees of fatigue, the body’s resistance declines, and germs enter and become infected.

4. The existence of immunosuppressive diseases also affects the immune effect of chickens, such as infectious bursal disease, leukemia, reticuloendothelial hyperplasia, Marek’s disease, infectious anemia and other immunosuppressive diseases, which can destroy chickens. immune system, making chickens immunosuppressed.

 poultry Chronic respiratory disease


Post time: Feb-25-2022