We use it in our pre-weaning vaccination program; but not for newborns - haven't had any reason to want to..
Vaccinated a group of 15 steers this morning with it + OneShot; will come back on them with BoviShield Gold 5 in 10-14 days.
It will not 'keep'; you need to use it within an hour or two(max) of when you rehydrate it - and keep it cool until you've used it all.
They do make it in individual doses - and that's what we've gone to, since we don't always have multiples of 5 to vaccinate. Yeah, it'a a pain in the butt to have to mix every single dose, but that's how we do it.