It's a good question that I don't know the answer to. This happened decades ago and is third hand at this point, so take it with a grain of salt (but check that it's actually salt first, and not, you know, Lysol).

Wondering the same thing. How would lysol end up in an IV?

I assume it's a fill your own bag solution not a sterile bag that said medical grade lysol.

He filled up his own IV bag with Lysol?

Makes no sense.

Perhaps generic Lysol. Generic white bottle with lots of text is common on ranches.

Gross negligence at best?

Vetrinarys - those that treat cows and big animals are rare. And always on the job. As in really always. Knew four, 2 had cancer, one had a burn out, one gave the big animals up for the pet-doctoring.