Polish/houdan 2 yr old Rooster, has lost weight. Not severe but noticeable as he is a big boy. Been wheezing off and on for months. Hoarse,shrill crow. Less, and sometimes nonexistent in cooler weather. Very cranky mood. Has never been aggressive until this. No other symptoms at all. Wheezing has increased dramatically with the summer heat. No other affected birds. Open stall enclosure, natural desert sand flooring. Housed with his mate (polish hen) and a turkey tom until a week ago. Turkey was culled. Healthy and well at cull. Began several months after being sick with DRY fowlpox (at least half my flock was affected, no deaths.) Possible dry mash feed aspiration as recent as 2 mos ago. Eating and drinking normally. Poop normal. Began Tylan50, administered by injection in skin fold, neck. First dose given Sat 6/18 evening. Giving 1/2CC twice a day for a total of 5 days/10 doses to end on Thursday morning 6/23. First dose Valbazen given tonight Tues 6/22 and will repeat in 3 days twice more. Treating based on assumed respiratory infection, remote possibility of gape worm. I don't think I have ever wormed this rooster in his two years. How soon will I know if the Tylan50 is/has worked in order to pursue other potential treatment? I don't want to drag this on for him if recovery is not possible. I'd rather cull him rather than let him struggle.