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What I suspect is going on is that the older birds are carriers of probably a mycoplasm infection, due to the swelling and mortality rate. I have used Tylan on chicks as young as a week old but I only give them a single dose in a day.
The Teramycin and Duramycin are not as effective and will not act as fast as the Tylan.
Use the Tylan 4 days after symptoms disappear but not longer then 7 days total. If they are not showing marked improvement in 4 days let me know and we will go a different direction. I will PM you the best way to get me.
Thanks Les, sorry to butt in on your post. I was just worried that they were so young & thought I had read something you posted about different dosage......Hope you know I cut & paste everything you post for my chicken binder. Thank you for always helping us out!!!
Okie chick your older ones can be carriers & not be sick, only new birds that come in contact with them will show signs.......that isn't always the case but does happen.