I guess my question to those who blame their abortions on the shots would have to be:
How do you know the shot was really to blame for the abortion? How do you know that the mare wouldn't have aborted anyway, even if you hadn't given her that vaccine?
People say that they have quit giving the vaccine & haven't had any increase in abortions. The thing is, you won't notice any increase in abortions if you don't give the shots....until the year when your mares actually get exposed to the virus and an abortion storm goes through your herd.
If you don't have the abortion form of rhino go through your herd, then the vaccine will do you no good. However, the year that rhino does hit your farm you will see a big increase in abortions--that is the year when you will realize the true value of the vaccine. If you've never experienced an abortion storm, then you just have no idea what it's like.
It hasn't happened to me, but I know people that have had it happen to them and I can assure you that after a year of losing 70-80% of their foals (and these are big herds, not just talking people that have lost 3 out of 4 foals) each and every one of those people have started giving the needles and each & every one of them say they will never again let their bred mares go unvaccinated.
We've always used Pneumabort-K and have nothing bad to say about it.