Aspergillus is a kind of fungus, and it is mainly caused by Aspergillus fumigatus, Aspergillus fumigatus and so on. Aspergillus, in addition to directly causing the disease, can also cause damage to the immune system of poultry and cause immunosuppression. After the immunization vaccine, it fails to achieve the desired immune effect and aggravates the condition.
Clinical Symptoms Chickens are depressed, with drooping wings, isolated from the outside, sluggish response to the outside world, drowsy or closed eyes, loss of appetite, or loss of appetite, increased desire to drink, late accompanied by diarrhea, faeces are gray-brown or yellow Green, feathers around the cloaca often contaminated with faeces, characteristic symptoms are shortness of breath, difficulty, gasping mouth, stretching head and neck, abdomen and two wings with breathing movements and showing a clear fan, sometimes making a snoring or whistling sound, nose Inside the slurry liquid. In the 3 to 6 days of the disease, the diseased chickens began to die within 2 days of the apparent symptoms. Before the death, the diseased chickens became sick. Some of the diseased chickens had cloudy or gray eyes on one or both sides of the diseased chicken. Small balls cause the eyelids to protrude.
Pathological changes in necropsy found that the dead chickens had pulmonary congestion, edema, and nodules ranging from rice to pea grains in the lungs. The nodules were pale, yellowish or yellowish, discoid, and slightly sunken in the middle. The airbag wall is thickened and covered with a layer of moldy hairy growth. There are fibrin and hyphae like lentils of small, round nodules nearby. Some nodules fuse together to form a large hard granulation. Swelling nodules, hard texture, cut nodules visible cheese-like material. There are also many yellow nodules of varying sizes on the surface of organs in the pleura and abdominal cavity.
The yellow and white nodules on the lungs and balloon of the diseased chicken were examined by microscopic examination. After crushing, the physiological saline was added dropwise and the surface was covered with a microscope. A large number of Aspergillus mycelia and conidia were observed. Mycelium was subdivided. Branches and divisions can be diagnosed as Aspergillus.
Drug control measures
(1) Elimination of severe diseased chickens and deep burial of the dead chickens, isolation and rearing of diseased chicks, removal of damp and mild litter, replacement of dry and sterile straw as new bedding, use of copper sulfate solution Disinfect the chicken house and site.
(2) Add moldy bezoar to the feed and use it for 5 days.
(3) In the morning, vitamin C and electrolysis were added to drinking water, and erythromycin thiocyanate soluble powder was added in the afternoon to prevent the secondary infection of mycoplasma and E. coli for 3 days. In addition, the drinking fountains should be cleaned and disinfected to prevent the feed from spilling around the trough, and the ventilation of the pens should be properly performed.
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