Causes of respiratory diseases in chickens
Release time:
Jan 15,2019
Respiratory disease is the most common type of disease in chicken farms, and its etiology is more complex. There are two causes of chicken respiratory disease, namely infectious and non-infectious. Infectious pathogens include bacteria, viruses, mycoplasma, etc., and non-infectious include environmental and management factors. Therefore, in order to prevent and control the respiratory tract, it is necessary to find out the cause and treat the cause. The main causes of respiratory disease are the following:
Damaged 1. respiratory mucosa
When the respiratory mucosa is stimulated by the adverse external environment, it will damage the respiratory mucosa, making it unable to play a normal immune protection function, and then cause respiratory diseases.
Under normal circumstances, the respiratory mucosa is covered with a layer of pseudostratified ciliated columnar epithelial cells, and the cilia keep swinging, putting pathogenic microorganisms and dust out of the body to prevent pathogenic bacteria from entering the body. Therefore, the respiratory mucosa is an important line of defense against the invasion of external pathogenic microorganisms.
Environmental factors of 2.-induced 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 rise and fall. The chickens are frequently subjected to environmental stress, resulting in a decline in resistance, which provides favorable conditions for virus invasion.
2. The chicken house is poorly ventilated, and the concentration of toxic and harmful gases in the house is too high, such as ammonia, carbon dioxide, and hydrogen sulfide, which can easily lead to the disease of the chickens.
3. Long sunshine time, suitable temperature, 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 randomly, which is easy to damage the respiratory mucosa of chickens.
5, chickens did not expand the flock in time, breeding density is too large, but also easy to lead to chicken disease.
3. the body's own immune factors
1. Laying hens are infected with mycoplasma disease or Newcastle disease, H9, transmission branch, larynx and other viral diseases, and when vaccine immunity is not in place, chickens are prone to infection.
2. Vaccination when the chickens are in a sub-healthy state can easily cause respiratory diseases. If the treatment is not timely, it is easy to cause secondary colibacillosis and mycoplasmosis.
3, laying hens after the hot summer and long-term egg production consumption, chickens began to produce different degrees of fatigue. The body's resistance decreases, germs enter while deficiency, and infection occurs.
4. The existence of immunosuppressive diseases also affects the immune effect of chickens, such as infectious bursal disease, leukemia, reticuloendotheliosis, Marek's disease, infectious anemia, reovirus disease and other immunosuppressive diseases, which can destroy the immune system of chickens and make chickens produce immunosuppression.
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