I tried to find some of the feed you linked but my searches are saying it is out of stock EVERY where.US govt. agency. I looked it up when it was the only feed available due to shipping issues, but I don't have the link to hand.
I have never heard of this stuff before so I am doing some digging now.
@aart
I have no idea if this is a "good" source or not.
https://poultryhealthtoday.com/bmd-whats-its-future-in-poultry/
and I do not know if this is current or not nor did I read it all.
https://www.federalregister.gov/doc...acitracin-methylene-disalicylate-bambermycins
edit to add one more.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6478705/