This may seem like a stupid question, but is it ok to vaccinate chicks for Marek's at 3 days old instead of a day old? I totally forgot to order the vaccine and was going to get it sent overnight but it is the weekend and they dont ship until Monday.....meaning it won't get here until Tuesday. The chicks are scheduled to hatch tonight (Saturday Night). Is it alright to vaccinate them at 3 days old instead of a day? Will it still be as effective as vaccinating at one day old? Thanks!