I did my first CD/T shot on April 16th and was getting ready to do the booster tomorrow (3 weeks later). I have read all sorts of different time tables. I have gone with the following from Fias Co Farm website. We do the 6 weeks and 21 days later.
Any science behind the different theories?
From Fias Co Farms Goat dose: SQ Injection
2ml (no matter what weight)- one or twice annually
Give to does one month before kidding.
Give to kids who's mother was vaccinated at 6 weeks and 21 days later.
Give to kids who's mother was not vaccinated at one month of age, a second does 21 days later and a third does 21 days after that.
You have not said how old your goats are or if they have ever had a shot but the Fias Co. Farms way to give injections is what I use and when we started following that plan I saw healthier babies being born the next season.
If your goats do not fall into that pattern then here is what I would do.
2cc for all goats now followed by 2 cc in 10 days then 2 cc in 6 months then once a year after that.