When we raise chickens in poultry farming equipment, it is common to vaccinate chickens to prevent disease, but sometimes it is still vaccinated. Why is this?

The first is that immunization is unscientific. The time of inoculation is not appropriate. Therefore, there is an inaccurate possibility of immune effect.

The second is that no antibody detection is performed. If the flock is in a special period, it is prone to immune failure without antibody testing.

The third is that the dose used for the vaccine is not accurate. It is not good for chickens to use large doses of vaccines.and is to cause adverse reactions after inoculation.