Causes and Countermeasures of Chronic Respiratory Diseases in Laying Hens in Spring
Release time:
Apr 29,2019
Chronic respiratory disease of laying hens is a disease with clinical symptoms mainly in the respiratory tract.,The disease is easily repeated. Usually occurs more in winter and spring,Due to cold air invasion,Coupled with the high density of chicken flocks.,When the insulation and ventilation cannot be well adjusted in the house,Easy to appear. Clinically, the causes are more numerous and interactive, making it more difficult to determine and eradicate than a single infection.
Causes of disease: when chickens suffer from certain infectious diseases, such as Newcastle disease, influenza, branch transmission, larynx transmission, mycoplasma, Escherichia coli, etc., can cause chronic respiratory diseases. In addition, when viral respiratory disease and Mycoplasma gallisepticum invade the chicken body at the same time, it can enhance its pathogenicity, make the chicken appear severe dyspnea and other symptoms, and cause death in severe cases. So remind the majority of farmers, daily epidemic prevention work must be done. At the same time to do a good job of daily disinfection, cut off the route of transmission.
Environmental factors: the excrement of laying hens contains a large amount of nitrogen-containing substances, decomposition will produce ammonia. Long-term exposure to an environment where the concentration of ammonia exceeds the standard can lead to a decline in the body resistance of the chicken, damage the tracheal mucosa epithelium, and cause the respiratory tract cilia to fall off, thereby reducing the ability of the air sac, bronchus, lung and other organs of laying hens to remove pathogens. In addition, the dust carrying pathogenic bacteria exists in the chicken house for a long time, which is also easy to cause the change of the tracheal and bronchial epithelial cilia of the chicken body, which reduces the function of the respiratory system of the chicken, and easily induces the outbreak of chronic respiratory diseases. Should be done, to ensure that the temperature at the same time, frequent ventilation, often ventilation, to ensure that ammonia and other harmful gases in the chicken house does not exceed the standard.
Stress factors: laying hens will be stressed to varying degrees when making vaccines, especially vaccines that cause adverse reactions to the respiratory tract, such as larynx, influenza, etc., can induce chronic respiratory diseases. If the physical condition and management conditions are good at this time, it is a transient performance. If the environment is too bad, secondary infection of other pathogens, the respiratory disease is easy to repeat. In addition, the replacement of feed, change the formula, etc. are also easy to cause stress in laying hens and lead to respiratory diseases.
Comprehensive above pathogenic factors, we farmers should be aware of the prevention of respiratory disease, focusing on the concept of management. In terms of management, the environment should be good and the stress should be small! In addition, after respiratory tract occurs, ventilation must be paid attention to during treatment. Only do a good job of ventilation in the house, chronic respiratory diseases will not be repeated.
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