The "warm sensation" of a layer of chicken is a mild type of chicken cold. About 80% of infectious diseases in poultry diseases and 20% of ordinary diseases; in infectious diseases, viral diseases account for 80%, bacterial and parasitic infections account for 20%; viral diseases, mild influenza and atypical Newcastle disease accounts for 80% and other viral diseases account for 20%. With the increase in the number of intensive chicken farms and the ever-increasing scale, the pollution has become more serious. In recent years, the control of mild influenza and atypical Newcastle disease in poultry has been increasingly difficult. This disease is used as the first killer of poultry to poultry. The development of the industry has caused huge economic losses. Prevalence Moderate chicken colds are mostly caused by the H9 subtype of the low pathogenic strain, and can be prevalent throughout the year. The mortality rate is very low, and it is usually sporadic death, but it is high in the spring. Since the spring and summer season is the off-season production period, Therefore, the laying rate of laying hens is often reduced significantly. High risk, rapid onset, high mortality, and unrecoverability: Egg disease after egg production is high, causing damage to the ovary of laying hens, even if the laying hens survive, their egg production will decline, or even become obsolete. The condition is complex, and cases of concurrent, secondary and mixed infections are more common: Newcastle disease and infectious bursal disease, Newcastle disease and infectious bronchitis, Newcastle disease and bird flu, Newcastle disease and E. coli disease are common mixed infections. Newcastle disease and chronic respiratory diseases are difficult to diagnose and difficult to treat. Widespread, widespread transmission methods and methods: global outbreaks; rapid spread (short-term proliferation, successive outbreaks), mostly epidemic, causing widespread killing of intensive production. Easily lead to immunosuppression, resulting in failure of immunity, or outbreak of disease during immunization. In addition to their own direct economic loss of death or loss of productive performance of poultry, more important is indirect loss, such as increased susceptibility to other diseases or Harmful. Clinical manifestations Diseased chicken intake decreased significantly, drinking water increased, mental depression, feathers fluffy, scattered, constricted, drowsy, sinuses, head swelling, chicken cocks showed purple-black edges, occasional leg hairless Department of scales bleeding . The diseased chickens have varying degrees of respiratory symptoms. Individual chickens have diarrhoea, excreted watery dilute feces, or yellow, green or light green dilute feces with undigested feed. Shortly after the occurrence of respiratory symptoms in some of the laying hens, the rate of egg production declines. In some chickens, the egg production rate declines first, followed by respiratory and gastrointestinal symptoms. The rate and duration of egg production declines are not exactly the same in individual chicken populations and generally fall by 20% to 35% or even 60%. At the same time visible soft shell eggs, faded eggs, brown eggs, misshapen eggs and other significant increase. Usually it drops to the lowest point after 7 days to 10 days, and it takes only about 2 weeks to recover slowly. The symptoms of young chickens are not very obvious and fewer deaths occur. The manifestation of respiratory symptoms is more obvious, the incidence is high, and mortality is closely related to concurrent infection. Nose flow mucus, a few head swelling. Suffering from chicken coughing, sneezing, snoring, breathing difficulties, or stretching mouth breathing, there is a strange call or mouth breathing, no sound or shaking head and so on. Pathological changes The chickens in the diseased chickens had crests on the edge of the crest, with lesions in the respiratory system and digestive tract, and the pathogenic chickens had milder flu lesions. However, chickens that died of colibacillosis and Clostridium perfringens infection showed pericarditis, pericarditis, hemorrhagic colitis, yolk peritonitis, and necrotizing enterocolitis, pancreatic and follicular hemorrhage, and varying degrees of swelling of the kidneys. Legs under the scales bleeding, throat, tracheal mucosa have different degrees of bleeding, ulcers. Chickens with reduced egg production rate, oviduct edema and congestion in diseased chickens, white paste-like paste-like secretions in the fallopian tubes, uterine congestion, edema, three to four times the normal volume, and mucosal bleeding in different degrees. ulcer. Control methods Immunization: Strictly and rigorously do a good job of immunization against chicken flu vaccines, especially in the high season of chicken colds. Once every 3 months to 4 months, immunize with H5N1RE-5+RE-4 and H9. The prevention of influenza vaccine for chickens takes 10 days. Effectively improve feeding management: adopt closed breeding, prevent wild birds from entering the coops through doors and windows; prevent water and feed from being contaminated by pheasant excrement; regularly disinfect chicken coops and the surrounding environment, strengthen chicken disinfection, and regularly eradicate chickens Destructive insects and rodents in the field; dead chickens must be burned or buried. Do a good job of chicken breeding management, improve the resistance of chickens, minimize the occurrence of stress factors, pay attention to changes in the season of autumn and winter, winter and spring, do a good job of warm and cold work; timely removal of feces, but also regularly in the hen house Herbs such as herb, eugenol, Artemisia, Artemisia, Artemisia, safflower, and other fumigation chicken coops, reduce the stimulation of bad gases, thereby reducing the incidence of respiratory diseases and intestinal diseases. For chickens with death and reduced egg production rate, Chinese herbal medicines with improved immunity can be used in time for the treatment of enteritis and salpingitis with sensitive antibacterial drugs, such as concurrent respiratory symptoms, and then with doxycycline. Vitamin B12, sodium selenite vitamin E, etc. are added to the feed during the fall. YT-88 YT-88 Shenzhen Sunshine Technology Co.,Ltd , https://www.yatwinsz.com