I just got mine yesterday and vaccinated 18 chicks. They were 13 days old but the guy from First State Vet Supply, Peter Brown aka The chicken Doctor said it's best to do day old chicks but you could do it any time and the info he sent said it should be done before 2 weeks old so I just made it.
I used 1/4 of the wafer. You will find the wafer is bigger than the opening in the bottle so you can't just dump it out so I used a clean needle and was able to score the wafer with the needle (attached to syringe so I could reach into the bottle). Then I just poked the needle into the piece I was going to use and lifted it out of the bottle.
Very easy to vaccinate but definately needed two people on chicks this age. I don'tknow how day old would be.
My chicks were a bit lethargic an hour or so after the vaccine but perked up later in the day and are fine today. I feel so much better now that that is done. Hopefully they didn't pick up anything before the vaccine. I guess it takes 2 weeks for the vaccine to provide the protection they need.
Hope everyone that is looking for the vaccine can get some. It is a very important precaution that could spare our beautiful birds from a very painful and prevenatable death.
There website says they have 150 vials available.
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