If you do mix vaccinated chicks with chicks from hatching eggs, I would band one group so you can track their health. That way, some months or years down the line, you may wish to know if a sick chicken was from the vaccinated group or the unvaxed.
There is always expensive DNA tests to see if Marek's is present, but those aren't always conclusive.
There is always expensive DNA tests to see if Marek's is present, but those aren't always conclusive.
