Our standard-size flock has contracted an upper respiratory illness. One hen has been put down and is at a lab - waiting for results, which might take a week. In the interim, i have some wheezing chickens, some worse than others. From all the reading here, it sounds like Tylan would be a good thing to use. The bottle i purchased states Tylan 50 Injection 50mg per mL. i also purchased needles at the feed store. Now, i have read that 1/2 cc would be an acceptable dose. But then i have read to inject into the chest opposite the side with the crop. i have also read it can be injected at the base of the neck, where the neck meets the body. i found a youtube video of a woman vaccinating a chicken on the back of the neck here: and that looks pretty easy. But i had also put a call into my vet and got a message back from the receptionist saying to put 2,000 mgs of Tylan per liter of water in their drinking water. So, i'm a bit confused about what to do. i'm not even sure if the Tylan i have is water soluable, or if it's only the kind to do injections with and there is another type of Tylan which can be put in the drinking water. My thought was to inject the three worst cases who are in isolation anyways and then put the Tylan in the drinking water of the rest in that pen, if what i have can be put in water. Any input on what has worked for others would be greatly appreciated.