I know how vaccines work, someone pointed out poisoning as a possibility, and a tainted (ie ‘bad’) vaccine or a contaminant in the vaccine could cause that kind of death rate. We once lost about 50 head because of a tainted vaccine.
I’m a SoDak farmer, not WI, btw.
I didn't mean to imply that you didn't. I only wanted to point out another possibility.
A bad vaccine is just as possible as any of the other rational explanations given so far.
BTW, I'm not a farmer and haven't been on a farm in a long time.