Okay, Hang head, I will admit it.
This is a bad subject on our farm and something we have talked about needing to improve. Honestly, we just reuse them, as in We use the same needle and syringe when we are vaccinating to do all the kids, ect... It is a bad habit we got from working for years on all those hog farms. You would just keep using the same needles, syringes until it was no longer sharp or break and then go onto the next one.
OUr new plan is going to be to use one needle per animal and then wash everything, soak in alcohol, and reuse after that. Roll, maybe you can jump up and down and scream at us, to get us to do a better job with this.