This is the revised FDA document for extralabel VFD that would apply to sheep.
http://www.fda.gov/ucm/groups/fdagov-public/@fdagov-afda-ice/documents/webcontent/ucm074659.pdf1. If you need to feed aureomycin to control abortion it should be possible BUT you have to follow the VFD
2. The VFD is something you get from YOUR vet. There has to be a vet / client relationship which most states have determined must include 1 or 2 farm visits from the vet per year.
3. You've got to keep the records for 2 years and other requirements for your vet.
4. Extralabel by definition includes using the product at a higher dosage than the label. So this would allow higher doses than 80 mg.
5. There are 3 parties to a VFD, the vet, the client (farmer), AND the feed mill. Even if you get a VFD that is per the dose you and your vet need you still need to have a feed mill willing to mix the feed per the VFD and sell it to you. We will see how this works out. It could be that we can buy the same bags of 4G aureomycin we used to be able to buy and the feed mill stamps the bags with something like, "ONLY FOR USE WITH VFD xxxxxx, ILLEGAL TO FEED TO ANY OTHER LIVESTOCK or OTHER ANIMALS FOR ANY PURPOSE". Or the feed mill may only sell it if it is mixed into a large batch. For strategies of feeding the product not every day I don't see how that would work.
6. If a feed mill is willing to sell the aureomycin they too have to keep records and I presume the cost of said bag is going to be more than it was at your local farm supply store this year.