After unsuccessfully searching all over for a vet to vaccinate my chickens for Mareks, I have decided to vaccinate my 3 chickens myself. I will get the vaccine from Jeffers, but I am unsure of where to get the syringes/needles, and more importantly how big/small they should be. I know most people vaccinate their chicks at 1 day old, but I am a first time chicken momma, and didn't realize it would be hard to find a vet to vaccinate my chicks that I hatched out of an incubator myself. I have seen people talk about needle gauge size for vaccinating the chicks for Mareks, but I would assume the gauge should be bigger when the chicks are 3 months old. Can anyone please shine some light on this for me? I want to vaccinate asap, because they are growing fast and still living in a brooder inside my house, and I want to move them outside to a coop. Any advice is welcome! Thank you!