I have been reading responses to questions about Tylan and seem conflicting to me. One gal said to use 1/8 tsp per gallon. Another says her vet said to use 1 tsp per gallon. One gal said that using liquid can cause problems with there throats if used orally. Thought it was an injectable. Have no idea. HELP!!! One hen coughing a little, no signs of mucus but a little raspy. Eyes clear. Do I need to separate her or should I treat all three hens exposed to her.