28/02/2022
《CHRONIC RESPIRATORY DISEASE》 ( )
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is a disease, caused by . M. Gallisepticum causes a Respiratory disease, affecting the entire Respiratory tract, particularly the airsacs where it localizes. All may be involved because cloudy in appearance and filled with mucus. In the later stages , mucus develops a yellow colour and cheesy consistency.
M.gallisepticum infection is extremely important both in and . While it's not a great killer. Affected laying flocks have been shown to produce as many as 20 fewer eggs per year than normal flocks. Also it is an important egg-transmitted disease.
The disease is by abnormal Respiratory sounds, coughing and nasal discharge. Symptoms are usually slow to develop and the disease has along course. Complicated CRD ( ) , also known as airsac disease is a severe airsacculitis, which occurs when M. Gallisepticum infection gets complicated by E.coli and some Respiratory virus infections.
●CRD through the following ways
-Infection is usually transmitted through the hatching egg. This is the major means of spread.
-carrier birds 🐦 are responsible for transmitting the disease. Direct contact of susceptible birds 🐦 with the infected carrier chickens causes outbreaks of the disease
- spread may also occur by contaminated dust, droplets or feathers 🪶 carried through the air.
- People are important carriers.
●The major symptoms may include
1. In adult flocks symptoms include abnormal Respiratory sounds, nasal discharge, sneezing, coughing, and breathing through the open beak. Feed consumption is reduced and birds 🐦 lose weight
2. In laying flocks, egg Production 🥚 decreases , and the disease is usually more severe during winter.
3. In young chicks there is rattling, sneezing, and sniffing, all indicative of a respiratory difficulty.
4. In broilers, most out breaks occur between 2 to 5 weeks of age
5. However, the appearance of disease depends, as already mentioned, on the presence at the same time of other disease-producing organisms, or stress factors. Uncomplicated infections usually cause no symptoms or cause mortality only in the very young.
*NOTE*
Treatment is only a temporary solution and is usually quite expensive. Removal of infection is the most satisfactory means of control.
Since M.gallisepticum is transmitted through eggs 🥚, maintaining chicken flocks free of M.gallisepticum is only possible by obtaining replacement flocks that are known to be free of the infection, and rearing them in strict isolation to avoid Introduction of the disease..