Terramycin is included in the class of 7 antibiotics likely to be further regulated. I don't recall if Tylan is also in that group of 7. This bill has been on the backburner for months in Congress and looks like it will come up for a vote soon.  



http://www.ucsusa.org/food_and_agriculture/solutions/wise_antibiotics/pamta.html

Preservation of Antibiotics for Medical Treatment Act

H.R. 1549/S. 619

Antibiotic resistance is a growing crisis. The overuse of antibiotics in both human medicine and animal agriculture contributes to the rise of antibiotic-resistant infections that are costly and difficult to treat. Moreover, the burden of antibiotic resistance is borne by the most vulnerable in our society: children, the elderly, and those with already weakened immune systems, such as people undergoing chemotherapy or persons with HIV/AIDS. But while doctors are actively curtailing unnecessary uses of antibiotics in human medicine, operators of CAFOs (confined animal feeding operations) continue to use vast quantities of these priceless drugs every day in the feed and water of animals that are not even sick.

http://www.wired.com/wiredscience/2009/07/farmantibiotic/

http://www.cbsnews.com/stories/2010/07/16/eveningnews/main6685734.shtml

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