How to Use the Newcastle Disease Vaccine in Chickens? A Detailed Guide to the Correct Method
From inquiries about the sick chickens admitted for treatment, it was found that most cases occurred because the owners did not vaccinate according to a proper immunization program. For the convenience of poultry farmers, the correct method of using the Newcastle disease vaccine is described here.
Newcastle disease immunization is an important measure for the prevention and control of Newcastle disease in chickens. The vaccines clinically used for Newcastle disease immunization are mainly live vaccines and inactivated vaccines. Whether live or inactivated, many factors affect the effectiveness of Newcastle disease immunization. In practice, full attention must be paid to the selection of vaccine type, the formulation of the vaccination program, the route of inoculation and the operating methods, so as to minimize immunization failure or adverse reactions.
The age for the first vaccination of chickens against Newcastle disease is 7-9 d. If the age is too young, when maternal antibody titers are high, vaccination not only fails to stimulate the body to produce the proper immune response, but the antibodies are instead neutralized, resulting in immunization failure. If the age is too late, an immune gap period easily occurs, and antibody titers fall below the critical protective value, causing the occurrence and spread of Newcastle disease. It is best to determine the age for the first vaccination by laboratory testing of Newcastle disease maternal antibody levels.
1. Drop instillation immunization method
The drop instillation immunization method refers to a method of immunization by intranasal drops, eye drops, or via the upper respiratory tract or conjunctiva. Dilute 500 doses of vaccine with 25ml of diluent. Lift the chicken's head and neck to a horizontal position, block one nostril with your hand, then instill one drop each into the eye and nose. Only after the vaccine has been inhaled and has spread within the eye should the chicken be gently put back, taking care to avoid missed drops, repeated drops, or failure to inhale.
2. Drinking water immunization method
To avoid the influence of contaminants or organic matter on the Newcastle disease virus in the vaccine, first clean the drinking water system, then mix the vaccine with about 30% of the chickens' daily drinking water volume, and make the vaccine-containing water quickly fill the drinkers, so as to prevent insufficient water intake by the flock or uneven amounts of vaccine consumed. Xiaolongnv 18845079758 The vaccine drinking time is best at feeding time, because the drinking rate of the flock during feeding is much higher than usual, and at this time the vaccine can make better contact with the chickens' mucosa. According to weather conditions or the temperature of the chicken house, withhold water from the flock for 2-4h to ensure the vaccine is finished within 2h.
3. Aerosol immunization method
This refers to the use of compressed air through an aerosol generator to make the diluted vaccine form atomized particles with a diameter of 1-10μm, which float evenly in the air and enter the chicken's body with breathing. The mist particle size should be moderate. If the mist particles are too large, they stay in the air for a short time and are also easily blocked by the mucosa, so they cannot enter the respiratory tract; if the mist particles are too small, they are easily expelled during exhalation. In addition, during aerosol immunization the chicken house should be sealed to reduce air flow, and doors and windows should be opened 20min after spraying.
4. Injection immunization method
Newcastle disease strain I vaccine and oil emulsion vaccine are administered by the injection immunization method. In particular, oil emulsion inactivated vaccines have the advantages of producing high antibody levels and lasting a long time, and are widely used clinically. In actual practice, the problems caused by improper injection of inactivated vaccines are also varied and should be taken very seriously. Chicks are injected subcutaneously in the neck;