When chickens are in the incubation period or not fully healthy, it's not advisable to administer vaccines or disease prevention measures. The birds have just recovered from illness, and their bodies haven't fully regained their strength. To ensure better immunity, it's recommended to give antiviral medication for 3 to 5 days before vaccination, then pause for one day, and proceed with the vaccination. This approach helps reduce stress and improves the overall effectiveness of the vaccine.
It is also important to avoid combining vaccination with other stressful procedures such as moving or transferring the flock. Performing multiple stress-inducing actions at once can overwhelm the chickens, leading to reduced weight gain, loss of appetite, diarrhea, and even death in severe cases. Therefore, it’s best to wait 3 to 5 days after moving the flock before carrying out any vaccination.
Another key point is that certain vaccines should not be mixed. For example, the Newcastle Disease I vaccine can strongly stimulate the production of anti-interferon in chickens, which may significantly weaken the immune response to other vaccines given at the same time. This can lead to incomplete or failed immunization. To avoid this, it's recommended to space out the administration of the Newcastle Disease I vaccine and the fowlpox vaccine by at least one week.
Lastly, vaccinating chickens during the peak of egg production is not ideal. At this stage, hens undergo significant physiological changes, which can weaken their immune system and make them more susceptible to diseases. It’s best to complete all vaccinations either before the laying period begins or after it has slowed down to minimize health risks.
By following these guidelines, poultry farmers can ensure a healthier and more stable flock, leading to better productivity and fewer disease outbreaks.
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