Ringworm in feedlot calves

I have 40 calves in feedlot and about half of them are getting ringworm. Wondering if there is a way to treat this many easily? Thanks

Honestly, I wouldn't worry about it too much.  Our entire pen of replacement heifers usually gets it over then winter.  They get over it, and are perfectly fine, just takes a bit for the hair to grow back in. 

my replacement heifers get it every winter as well. it will heal on its own

it looks like hell and Id treat it immediately..  Iodine and salt are both good treatment options. Diluted bleach is also effective.

If it's just ringworm in the feedlot, let it run its course, don't waste your money on treatments, our replacement heifers get it every winter, it goes away. The only bad news is that you have ringworm on your premisis which means your feedlot will have it every year from now on....not a big deal...roll on.... when the sun comes out it will go away....