1. Ascites in broilers and sudden death cause a certain percentage of deaths. Countermeasure: The broiler controls the amount of feed before 30 days of age. The method is: After night darkness, the time for turning on the lights is postponed to 10 to 12 o'clock, so that the time for feeding chickens is reduced by 4 to 5 hours per day. This method can greatly reduce the incidence rate. 2. Coccidiosis "cure" and then relapse. Countermeasure: Replace the litter on the last day of treatment to maintain the amount of medication. 3. Broilers pull yellow-green stools after 30 days of age, with respiratory symptoms, and are essentially ineffective with drug control. The main reason is the combination of infection caused by immune failure, common atypical Newcastle disease and more moderate types of infectious bronchitis (mainly adeno-gastric type) secondary E. coli disease and mycoplasma infection. Countermeasures: broilers 9 to 10 days of age subcutaneous injection of a new branch of oil seedlings 0.4 ml. Newcastle disease + multivalent transmission (including lung, kidney, glandular stomach type) vaccines produced by Qingdao Yibang Company and Qingdao Baoyite Company can be used. 4. Infectious bursal disease cannot be prevented. The main reasons are: the presence of wild virus serotypes and super virulent; most field farms have wild virus, and the current disinfection methods have no way to eliminate; breeder farm egg antibody titers are very low, some high and low, resulting in chicks Early infection; the traditional method of immunization is to vaccinate more than 10 days of age, and at this time the chicks have long been infected with virulent, often appear soon after vaccination; phenomenon (drinking eye drops, nasal drops or) drinking water vaccination dose and It is difficult to control the viability of the vaccine, resulting in the onset of some chickens. Countermeasure: Early immunization. The first immunization was carried out on the 4th day. Each chicken was vaccinated with one vaccine and on the 15th day of the second exemption. Two chickens were vaccinated with each vaccine, and 0.5 ml of water was added. Vaccine is the preferred K87 produced in Israel. The domestic vaccine is preferred to be a trivalent attenuated vaccine in Heilongjiang. 5. Traditional chickens are often treated after the onset of illness, causing increased costs and a high deadweight rate. Countermeasure: Take preventive medication. The method is: After 3 days of treatment, the animals are used together for 3 days, and then they are administered once a week for 1 day. The order of drug selection for chronic respiratory diseases was roxithromycin, erythromycin thiocyanate, and tiamulin. The order of drug selection for E. coli, Salmonella, Staphylococcus, etc. was amikacin, amoxicillin, doxycycline, neomycin, ofloxacin, and others. 6. The chicken snoring and throwing the nose is considered to be chronic respiratory disease and the effect of medication is poor. In fact, 80% of chickens have snoring symptoms of E. coli, and a small part of E. coli and chronic respiratory diseases. Countermeasures: E. coli disease is first treated and then chronic respiratory disease is treated. 7. Misuse of drugs: (1) Drinking with gentamicin. Gentamicin is not easily absorbed orally and does not serve the purpose of preventing and treating diseases. Instead, it costs money and makes a mistake. (2) When anticoccidial drugs are used, antibiotics are used at the same time, resulting in chicken poisoning, mild growth retardation, and severe death in large numbers. Countermeasure: Gentamicin should be injected intramuscularly. Antibiotics other than amoxicillin are strictly prohibited when using anticoccidial drugs. Plastic Net,Plastic Netting for Garden,Plastic Trellis Net,Plastic Net Fencing COFCO HEBEI INTERNATIONAL TRADING CO., LTD. , https://www.cofcohb.com