What's worse, cattle and horses also tend to pass broad leaf killers, such as picloram, straight through. Picloram is widely sprayed on hay fields, where it kills broad leaf and plants, and allows some grasses to thrive. Corn and wheat, which are members of the grasses family, suffer from reduced production when exposed to picloram. Soybeans, and basically any other crop that is not a grass, are devastated.
Deworming agents are pretty brutal on the soil as well. They’re strong enough that the resulting manure can kill beneficial critters like earthworms.