Buy quality equipment and maintain it to give the birds the expected feed intake and improve consistency. Water vaccinations are among the most practiced method of delivering vaccines to birds. This is also the most abused method of vaccinating birds. All birds in the house must get a drink of the vaccine within a two-hours of vaccine dilution. The secret to successful water vaccination, is getting all the birds to drink the vaccine.
Water deprive the birds the afternoon before or morning of the vaccination.
Drain the water lines. Timing, vaccine volume, and weather conditions should be considered. In most cases draining the water lines before the lights go out the day before vaccination will allow the birds to be thirst the next morning. All the birds must get to the drinker when the vaccine is present. If the birds are too thirsty, the first ones at the drinker will consume all the vaccine.