Some laying hen farmers may encounter such a situation in production: the spare chickens are well-cultivated, and their weight and evenness are up to the standard. However, during the production of eggs, the chickens cannot get to the peak of the production, and the chickens are carefully inspected to find that some chickens are found. It cannot produce eggs at all. The reason for this "female hen" is that chicks infected with reproductive infectious bronchitis within 1 to 2 weeks of age, resulting in the development of the fallopian tube or intermittent development. The appearance of laying hens is not abnormal, and it is not easy to be found before laying eggs. Only the laying period can be found and treatment with antibiotics is ineffective.
The main causes of chick-infectious infectious bronchitis are:
(1) Chickens infected with infectious bronchitis virus within 1 to 2 weeks of age;
(2) Infectious bronchitis is not immune;
(3) The internal and external environment of the chicken house is not well controlled within 2 weeks before brooding;
(4) Secondary infection with E. coli and mycotoxins;
(5) The existence of immunosuppressive diseases, resulting in immune failure of infectious bronchitis;
(6) Infectious bronchitis immunization procedures are not suitable for this field.
Control Strategy:
(1) Do a good job of immunization.
(2) Strengthen the cleaning and disinfection work of the chicken house before entering the chicks. After entering the chicks, the inside and outside environment of the chicken house should be controlled. The internal and external environment of the chicken house should be thoroughly disinfected once a day to reduce the content of infectious bronchitis virus inside and outside the house.
(3) Strengthen rearing and management of chicks within 2 weeks of age, maintain temperature stability, and reduce stress in chickens.
(4) Prevent the occurrence of conditional diseases such as mycoplasma disease and E. coli disease and prevent mycotoxin poisoning. The occurrence of these diseases will cause immune failure.
Reproductive bronchitis immune key:
(1) Principle of immunity. After the chicks arrive on the field, live vaccines should be immunized immediately to establish local mucosal resistance.
(2) Vaccine selection. Due to the large number of serotypes of infectious bronchitis virus and poor cross-protection among various types, a variety of serotype vaccines are selected as much as possible during immunization to form cross-protection. First-vacuum (1 day old) with H120 or MA5 strain, second immunity (7 days old) with H120 + 2880 strain, and three immunity (17 days old) with live vaccine (Mass strain and Coon strain) + inactivated vaccine (New branch oil seedlings).
(3) Immunization method. General use of nasal drops, eye method. Intranasal inoculation: Block the nostrils on one side of the chicken and inject the vaccine solution into the other nostril. Eye inoculation: Hold the chicken sideways and drop 1 drop of vaccine solution into the open eye. After the vaccine liquid is absorbed, release the chicken.
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