In rainy summer and autumn seasons, chickens often develop a disease characterized by white-wrinkled chicken cocks, which brings significant economic losses to the chicken industry. This is known as white-crest disease. The library is the media of the disease.
Chicken white-crown disease is a kind of hemosporesis caused by leucococcus parasites in chicken leukocytes and red blood cells. There are many kinds of leukocyte protozoa in chickens, of which Leucococcus spp. is the most common and the most serious. It usually occurs in summer and autumn. Infected chickens are characterized by extensive bleeding of muscle tissue and internal organs. The chicken's crown is named after its pale blood loss. It is also known as mosquito disease in some places.
Disease necropsy diseased chicken showed body weight loss, blood became thin, thin, chest muscles, leg muscles have obvious sesame size bleeding or snow spots, pale muscle, hepatosplenomegaly fragile with bleeding or white spot nodules feature.
First, epidemiological live white blood cell protozoa in the chicken body for asexual reproduction and sexual reproduction, such as crickets and other blood-sucking insects to form reproductive sporozoites. Its life history is chicken → chicken → chicken. Therefore, this disease often occurs in the summer and fall of the flies, all kinds of day-old chickens are susceptible.
Second, the clinical symptoms of this disease chicks symptoms are obvious, chicken body temperature rise, loss of appetite, mental depression, runny nose, yellow white or yellow and green dilute feces, growth and development blocked, loose feathers, walking, breathing difficulties, hemoptysis, etc. . The laying rate of laying hens is reduced by about 10%. The most obvious feature of all diseased chickens is anemia, and the cocks are pale and bloodless. The necropsy found that the carcasses were thin, blood thin, and the body muscles pale. Hepatosplenomegaly, splenomegaly, bleeding spots on the surface, and miliary white nodules on the liver. Gastrointestinal congestion, blood in the abdominal cavity. Kidney bleeding, point-sized spotting on the leg and chest muscles. According to the season of onset, clinical symptoms and necropsy changes can be made to make a preliminary diagnosis, combined with blood smear microscopy to see the body can be diagnosed. The morbidity of the disease was so intense that it usually did not pay attention. When the chickens were fed, we found sick chickens or dead chickens at the corners of the wall. Severe chickens were bleeding or bleeding after death. The age of onset is usually around 15-35 days.
Third, the diagnosis According to the epidemic season, clinical symptoms, pathological changes can basically make a diagnosis, if necessary, blood smears can be obtained, after Wright staining after high-power microscopy of the cartilage leukocyte protozoan gametophyte body.
Fourth, an important task in the prevention and control of the disease is to try to eliminate the media repository. Can be used to enter the sheds of adults like the characteristics of blood sucking, in the season of locust abuse, inside and outside the house should be sprayed with insecticides weekly (fenvalerate, etc.) to kill the adult.
In the epidemic season of this disease, sulfa drugs are added to chicken feed for prevention.
When the disease occurs, you can use sulfaquinoxaline soluble powder to drink water, the first amount can be doubled, once every 3 days, every 2 days, and then once again for 3 days, vitamin K3 or blood pressure should be added properly.
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