@Cjarvis , was this used in conjunction with other antibiotics? I have some birds on cephalin and ciproflexin. I also have some that I was planning on administering Tylan to, as the other stuff did not clear it for them.
Tell you - I have at least 11 sick birds, and last night in the coop - it seemed as though all I heard was coughing and unhappy breathing.

I think my only HEALTHY birds are the chicks in the brooder. I have a few trios of healthy show birds, but with the weather like it is, there is no where to put them where they aren't exposed to sick birds. l
I have not used the Tylan yet. The 'sick' (kennel) birds have been on the pig food for 2 days. I have some birds that are responding to the cipro/ceph combo - but others not so much.
I am thinking, that at the least, I should switch my entire coop to the pig feed? That will be expensive.... but this individual treatment stuff and 'isolation' .... I have no more kennels, no more heat sources, no more porch and no more ... well, you know....getting closer to some kind of limit.
On a cheery note - the paint and black silkies that are the kid's 4-H project did quite well at our livestock show and bonus auction yesterday - as did one of our longhorn heifers. .... oh yes, which started coughing and runny nosing yesterday too - hope it is the weather - but if not still requires a lot less effort to treat.. 'sigh'
Off to check on a very prego cow.... will deal with chickens later. Thanks for any help and input!