Botulism is a bacteria that can cause a fatal paralysis. It can be vaccinated against.
There are a number of potential sources of botulism poisoning:
2)Contaminated Water Sources
3)Fertilizing Pasture With Chicken Manure
All farmers who feed out sileage should consider using this vaccine. We do see outbreaks in this area of botulism. There is no treatment for Botulism, and will often affect large numbers in the herd. It is often found in dead carcasses, but can also be found in some birds and around watering holes.
The initial dose can be with the longrange vaccine, which will allow you to give only dose to start with. But due to the fact that there is minimal natural exposure, the current recommendations are to use an annual vaccine to keep immunity high.