Okay, I didn't want to hijack the other threads that were dealing with this topic as an adjunct to their main question....SO.... I bought day olds last year that I presume were vaccinated. If I find out for sure that they were, do I need to vaccinate my new hatchlings? I really need a definitive answer for this ASAP as I had 6 hatch yesterday and will be setting the next batch into the hatcher on Sunday. Most of these birds, except for my Salmon Favs and Jessica's blue orps, both of which we want to breed, will be coexisiting with my older birds from the feed store. Should I vaccinate my chicks?