I have chickens that have an respiratory problem. I just introduced new chickens that had it, but thought they were better. I let them out of their coop. My chickens that I already had though caught what they had and they seem to be getting it back. Today my older chickens are not eating a lot and are lethargic. I did get them VetRx and Tylan 50. My question though is, is the Tylan 50 just as effective if given orally through a syringe just as effective as given orally? I really need help. Like I said the 4 month old chickens do not seam like it is bothering them as much as the older ones. I have also given them apple cider vinegar water too. Please help!!!