Chronic respiratory disease is a respiratory disease caused by Mycoplasma gallisepticum in old hospital black chickens. The presence of mycoplasma in the body of chickens, it can be said that in a variety of commercial chickens, a certain percentage of chickens have this pathogen. However, under normal circumstances it will not cause illness. Therefore, the cause of chronic respiratory illness is caused by some environmental changes. So what are the specific causes of these mycoplasma pathogens?
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1. In the spring, autumn and winter seasons, the temperature difference between day and night is relatively large or is attacked by the cold current. Because the cold prevention work is not done in time, the chickens are affected by cold.
2. Poultry ventilation is poor, the concentration of toxic and harmful gases in the house is too high, such as ammonia gas, carbon dioxide, hydrogen sulfide concentration, the incidence of chickens.
3. The breeding density is too high, and the chickens are onset.
4. When various diseases occur, such as chicken Newcastle disease, infectious bronchitis, infectious laryngotracheitis, infectious rhinitis and other diseases, secondary to chronic respiratory diseases.
5. When the chicken is too young, even normal aerosol immunity can stimulate the disease.
In general, all unfavorable factors in the outside world may be the cause of the disease.
In the old hospital black chicken group, the following symptoms occur in the presence of chronic respiratory diseases:
Chronic respiratory diseases are characterized by acute onset, slow transmission, and long duration. In the absence of other diseases, only due to changes in temperature, high stocking density, and simple infections during poorly ventilated chicken houses, most chickens have little change in spirit and appetite, and a few chickens have enhanced breath sounds (only heard at night). ). The above-mentioned factors are too strong to cause disease in most chickens. At this time, feed consumption is reduced. In chickens, some chicken eyes can see tears, throwing noses, and facial swelling. Most of the eyes tears are one side of the eyes, but also tears in both eyes. If the treatment does not change to chronic in time, the appetite of the chicken is good or bad, there is caseous exudate in the eye, and some, such as the size of beans, can cause blindness in severe cases. A few chickens died of suffocation due to a blocked throat. If there is no secondary infection, the mortality rate is low. The main pathological change after death of the dead chickens was airsacculitis. The effect of disease on egg production in adult chickens is the least affected in respiratory diseases. However, E.coli is often secondary to the disease in actual production, especially in broilers. As a result, the condition is complicated and the chicken's mortality rate increases. Chickens that died of mixed infection with E. coli showed pericarditis, pericarditis, and airsacculitis after dissection, and some of them also showed pathological changes of yolk peritonitis. In most cases, the disease occurs in the course of many diseases. Therefore, the pathological changes after death of dead chickens can also see the changes of the primary disease.
In prevention work, the first thing is to do a good job of vaccination against various viral diseases.
Followed by strengthening the feeding and management to carefully manage the flock of chickens, summer heatstroke to cool down, winter to keep warm. The ventilation of the house should be done throughout the year to create a better living condition for the chicken.
Once a chronic respiratory disease occurs, it is important to do its best to remove the cause of the disease and improve the environment. This will help reduce the occurrence of the disease and help improve the therapeutic effect. If there are other viral diseases, it is mainly to control viral diseases.
In order to prevent the secondary infection of the disease can be properly administered to control. The principle of treatment should take into account the number of affected chickens. In the old hospital, black chickens are mainly treated with individual treatments. When the incidence of chickens is large, and external incentives cannot be removed immediately, consider combining large groups with individual treatments. The drugs to be treated can be selected as such. Individual chickens can be treated with streptomycin, adult chicken 200,000 units per day, divided into 2 injections, or kanamycin 10,000 units / day, divided into 2 injections, continuous injection of 2-3 days. The whole group can be given streptomycin, erythromycin, renoxacin, Zhiyuanjing, drinking water for 3-4 days. If mixed infection with E. coli, the main treatment of E. coli disease drugs.
Old House Black Chicken Respiratory Disease - Chronic Respiratory Disease