Causes and prevention of poultry respiratory diseases in winter
Every winter, as the weather gradually gets colder,poultry farms(households) often reduce the ventilation volume in the house in order to maintain the temperature in the house, which is likely to cause a high incidence and prevalence of poultry respiratory diseases in winter. Poultry's susceptibility to respiratory diseases is not only related to the physiological structure of the poultry respiratory system, but also closely related to management factors (non-disease factors) and non-management factors (disease factors). Let’s elaborate on these aspects below!
Physiological structure characteristics of poultry respiratory system
1. The respiratory system of poultry is different from that of mammals. In addition to the lungs, there are 9 thoracic and abdominal air sacs.
2. There is no diaphragm between the thoracic and abdominal cavities, and the thoracic and abdominal cavities are connected, resulting in frequent peritonitis.
3. The position of the lungs is fixed, and the performance is worse than that of mammals.
4. The respiratory tract is relatively long and the respiratory rate is high.
5. The end point of the respiratory system is not the alveoli but the air sacs. There are no capillaries in the walls of the air sacs, and preventive drugs cannot reach the air sacs through the blood circulation. Therefore, once poultry develops air sacs, it is difficult to treat them.
Factors in feeding management
1. Changes in ambient temperature
When the external ambient temperature drops, the temperature in the poultry house cannot be raised in time, resulting in temperature difference or temperature instability in a short period of time, causing cold stress and inducing respiratory system diseases; when the temperature in the poultry house is too low, the humidity is too high, the ventilation is poor, harmful If the gas exceeds the standard, the poultry will appear cough, tracheal rales and dyspnea, which are characterized by respiratory diseases.
In autumn and winter, the stocking density is generally increased, the air quality in the house is seriously reduced, hypoxia, and harmful gases are seriously exceeded, which aggravates respiratory diseases.
2. Vaccination stress
The essence of vaccinating poultry is to simulate the mild pathogenesis of infectious diseases, so it will definitely cause different degrees of respiratory symptoms, that is, vaccine reactions. Generally, after 2-3 days, the respiratory symptoms will disappear automatically, and in autumn and winter, due to the unstable temperature in the house, the normal vaccine reaction will also become a continuous respiratory disease.
In the treatment of this type of respiratory disease, the main focus is on management:
1) In the case of maintaining the required temperature in the house, the minimum ventilation volume should not be lowered.
2) Necessary drug prevention should be carried out before and after immunization to rapidly increase the level of vaccine antibodies, enhance the immune effect, and alleviate the vaccine stress response.
3) Do a good job of ventilation in the house, reduce the concentration of harmful gases such as ammonia in the house, avoid immunity, and strengthen disinfection management.
non-feeding management factors
Poultry respiratory disease in a broad sense is a general term for respiratory symptoms caused by various diseases. Commonly seen clinically in poultry, such as sneezing, sneezing, sneezing, dry and wet rales, wheezing, coughing, etc., are only respiratory symptoms; Air sac colibacillosis, fungal infection and other diseases can cause respiratory symptoms in poultry. Therefore, clinically, the etiology of respiratory symptoms should be analyzed in time, and then symptomatic treatment should be carried out. Drugs should not be used blindly but cause side effects. Don't even mention that respiratory drugs are synonymous with so-called macrolide drugs.
First of all, the most important thing is to prevent mycoplasma disease and protect the epithelial cells of the respiratory mucosa.
1. Listen to the sound to diagnose the possible cause
Classification of sounds
Vaccine reaction, Mycoplasma
Early stage of viral disease
snoring, the cry of frogs
Viral disease + bacterial secondary
Severe viral disease (such as bird flu)
coccidiosis, enteritis or strep throat
Wheezing, no discernible sound
Prevention of various respiratory symptoms caused by mycoplasma, vaccine reaction, environmental stress, etc.
How and when to use
Continuous use for 4-5 days, 2 hours after vaccination
Thursday, December 1st, 2022
Sunday, December 4th, 2022
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