Some, sure.
The evidence of disease, however, is pretty clear with the diseases we get our here.
It’s really not hard to keep cattle clean.
Just raise them in a big pasture, with clean water, don’t let them stand in their own sh!t (or sh!t in the water, which you can do with a berm), and feed them clean hay.
Well, I’ll agree with you there, that’s why hogs are so loaded with parasites, they lay in the own crap all day long, and it’s full of worms, pinworms, strongyloides, roundworms and just a whole host of things.
Ever give your cattle Fenbendazole, Praziquantal, Menbendazole, Albendazole?