Went to the vet looking for some tylan for my birds. They did not have it and sent me to a feed store guy that should have it. So after 50 miles of driving today he did not have it also. He did have this stuff called DURAMYCIN-10. Now all i can find is people saying do NOT use it for laying hens and others are saying its a 21 day withdrawl from eggs. Anyone here use this stuff and how well did it work.