I don't know if fulvison is till being produced, but it is for horses so he is not suppose to give it to you for cattle. Not saying that some vets won't prescibe it for cattle. My vet prescirbed a granule iodine that I mix with salt and add it to their feed. That and I have been spraying the spots with iodine. It is hard to get rid of in the winter. I have tried anti fungal creams, blue star ointment, ringworm sprays and this seems to be working the best. A lot of people use fluid film but I have heard that you shouldn't use it on their heads and around eyes and that is where ours mainly had it. Good luck.