My rooster sounds like he has a respiratory infection. I keep Tylan 50 on hand just in case but my supply is running low so I looked online to buy more and it looks like no one has it available. I can't find 200 either. Is there a problem going on with the manufacturer? Does anyone recommend a good replacement? He is sneezing, has diarrhea, and rattling breath but otherwise eating, drinking, and is active. I've been able to get it at my local TSC in the past.