Prevention and Control of Mycoplasma Synoviae in Laying Hens
Release time:
Jun 14,2018
Pathogen: Mycoplasma synoviae
popular features: mainly occurs in 4-16 week old chickens, adult chickens are occasionally seen. Chronic infection after acute infection can last for life. The disease can be transmitted vertically or horizontally.
clinical symptoms: Sick chickens have closed eyes and neck at the initial stage, rough feathers, stunted, slow movement, and reduced appetite; and then appear emaciated, difficult to walk, limp, and gait is "eight" or "stilts"; severe ones are stunted and cannot stand. Swelling around the joint, especially the knee joint and the paw pad are the main target organs. Sick chicken keel lateral skin feel thickening swelling. Because sick chickens can't stand up, leading to insufficient drinking water, dry and fine feces will appear. Pay attention to the distinction from glandular gastritis.
necropsy lesionThe lesions of chicken are mainly synovial sacs of sternum, knee joint and toe joint. The synovial sacs of sternum and tendon sheath will have exudate, which is transparent at the initial stage, gradually changes into pale yellow clear jelly-like mucus, and then gradually changes into turbid viscous cheese-like yellowish white exudate. In chronic cases, yellow to orange-yellow exudate can be seen on the joint surface of the hip joint, elbow joint and wrist joint.
DiagnosisAccording to the age of onset, epidemic situation, clinical symptoms and necropsy lesions, preliminary diagnosis can be made, and laboratory tests are required for diagnosis.
prevention and control measures:
This disease is a stress disease, cold stress and poor air quality will largely induce this disease. Generally speaking, the brood will no longer keep warm in the brood house for about 30 days. Due to improper ventilation and cold stress caused by temperature difference between day and night, the disease will show a high incidence at this stage. As the age of the chicken increases, the ventilation volume of the chicken increases. At this time, if the ventilation does not keep up, the disease is easily induced. Therefore, reducing cold stress and ventilation is an important part of preventing this disease.
This disease is mycoplasma disease, easy to repeat, more difficult to cure completely. Severe disease of thin chickens will occur growth inhibition, although the mortality rate is low (about 1%-10%), but the comprehensive accounting has no therapeutic value, should be eliminated in time. The chickens with mild illness can be treated with tylosin, doxycycline, tiamulin, enrofloxacin, tyvansin, ligomycin, warniaolin and other drugs, and the traditional Chinese medicine using the extract of Scutellaria baicalensis Georgi has better effect.
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