Prevention and control of chronic respiratory diseases in chickens in autumn and winter
Release time:
Oct 09,2019
Chicken chronic respiratory disease is a respiratory infectious disease caused by Mycoplasma gallisepticum. The fatality rate of this disease is not high, but the growth and development of chickens are poor, the egg production of laying hens is decreased, the feed conversion rate is low, and the production performance is decreased. Although there are many drugs can be treated, but difficult to eradicate, easy to relapse. So that chicken growth and egg production can only maintain a low level, causing significant economic losses to the breeding industry. This disease is easy to be mixed with colibacillosis and cause a large number of chicken deaths.
popular features
All day-old chickens can be infected with the disease, with a higher incidence of chicks, the disease can occur throughout the year, in the cold season, high density, poor ventilation of the chicks most likely to occur. Recessive bacteria-carrying chickens and sick chickens are the main sources of infection. They can be infected by respiratory tract infections through coughing and sneezing of sick chickens, or through feed and drinking water, and can also be infected through mating.
This disease is a disease transmitted through the egg. The eggs laid by diseased chickens and infected chickens contain mycoplasma, and the chickens hatched with their contaminated eggs are infected, resulting in the prevalence of bacteria in most chickens.
There are obvious inducements for the occurrence of the disease, such as high feeding density, poor ventilation, excessive ammonia concentration or large temperature difference, lack of vitamin A in the material, poor resistance, etc., which will lead to the occurrence of the disease.
The mortality rate of chickens infected with this disease is not high, but it is easy to be mixed with E. coli in the process of its occurrence, which makes the condition worse, causes serious losses, and the death rate is significantly increased.
Concurrent infection has a considerable impact on Mycoplasma gallisepticum infection, even if the pathogenic Mycoplasma gallisepticum infection is not strong, it is often due to vaccination (especially drinking water or spray immunization) and the outbreak of mycoplasma disease.
clinical symptoms
Chickens infected with mycoplasma, flow of serous or mucous nasal fluid, sneezing, tears, after the spread of inflammation to the respiratory tract caused by cough, asthma, snoring. Sick chickens are listless, loss of appetite, standing with their heads bowed and necked down, growth and development are blocked, and the suborbital sinus of chickens with a long course of disease is swollen, and the upper and lower conglutination are together, leading to blindness, and there are cheese-like objects of different sizes in the eyes.
pathological changes
The main lesion of autopsy is that the oral cavity is full of mucus, the mucous membrane of the larynx and trachea is swollen, the surface of the mucous membrane is gray white mucus, the secretion of edema of the larynx is increased, and yellow cellulose exudate is common. In severe cases, caseous matter blocks the throat, causing suffocation and death of sick chickens. When air sacs inflammation occurs, visible changes in the chest and abdomen air sacs are obvious, air sacs are turbid, air sacs are edematous, the surface of the sac is hyperplastic, the appearance is moniliform, the surface of the sac is caseous, accompanied by symptoms of pneumonia. Inflammation of the mucosa of the suborbital sinus, turbid mucus or cheese-like exudate in the sinus cavity, and light yellow cheese-like substance can be extruded from the conjunctiva of the elderly.
integrated prevention and control
Prevention:
1. Good ventilation is the key measure to prevent the disease
2. Strengthen feeding management, maintain the appropriate temperature in the chicken coop, and do not change from cold to hot, especially in the brooding stage.
3. Maintain appropriate density, feeding density is too high, easy to stimulate the disease.
4. In the cold season, pay attention to solve the contradiction between heat preservation and ventilation.
5. In the multiple stages of mycoplasma, such as brooding, turning, drinking water immunization or spray immunization, etc., if necessary, drugs for prevention and treatment of mycoplasma can be added in drinking water.
6. Ensure the nutrition of chicken feed, especially the addition of VE, VA, etc.
7. Pay attention to the prevention and control of other respiratory diseases, such as Newcastle disease, branch, throat, rhinitis, etc. Prevent secondary infection of the disease.
8. Prevention and control of immunosuppressive disease. Such as bursal disease, transmission of poverty, leukemia, etc.
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