My BA Hen that is 8 months, starting doing something that sounds like a sneeze, a cough, and a hiccup mixed together. This started Tuesday(at the least) and someone suggested that i use Tylan 50. My question is what's the dosage? is there an egg withdrawel? how long do i keep her on it? and do i use injectable or orally? She is also breathing funny. I thought about this last night, Nugget is in a coop with 4 BLRW pullets that are 3 months younger than her, they smell differently and have a strong odor, could she just be very sensitive to their odor? Thanks