I have received my vaccine administration system. I'm waiting on my refrigerated vaccines against marek's disease.
The vaccine comes in vials of 1000 doses that need to be kept at 2-8c. I have set up refrigeration to accomidate that. Once the vaccine is rehydrated, it's viable for 1 hour. Anything left over must be destroyed. Chicks must be vaccinated within 24 hours of hatching, which gives a very limited window.
For that reason, i've decided to hatch as many eggs as I can fit in my incubator. Non-viable eggs after 7 days will be discarded, so I'm hoping for a full batch of 30 if i start with 40.