Three factors tell you the origin of poultry respiratory tract

1. Damage to
  the respiratory mucosa When the respiratory mucosa is stimulated by the adverse external environment, the respiratory mucosa will be damaged, making it unable to perform normal immune protection functions, and then 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 are constantly swinging to move 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.
  2. Environmental factors that induce respiratory diseases
  1. The seasonal climate is changeable, and the temperature difference between day and night is large, which can easily 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. The ventilation of the chicken house is poor, 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 disease in chickens.
  3. The light 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 randomly, which is easy to cause damage to the chicken respiratory mucosa. Broiler chickens are not expanded in time, and the stocking density is too high, which can easily lead to chicken disease.
  3. The body's own immune factors
  1. Recessive infection of mycoplasma disease or viral diseases such as Newcastle disease, H9, mycoplasma, and pharyngitis, and chickens are prone to infection when the vaccine immunity is not in place.
  2. Vaccination when 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 mycoplasma disease.
  3. Due to the long-term consumption of laying hens, the flocks begin to experience different degrees of fatigue. The body's resistance decreases, and germs take advantage of the deficiency to enter and cause infection.
  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, reovirus disease and other immunosuppressive diseases. Diseases can destroy the immune system of chickens.
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