Our three, one-year old roosters have had a mild respiratory issue for about six months now. Because of various family emergencies, ect. . . . we just treated them with tylan and sulmet (2 days of sulmet) about a week ago. The first two roosters seem to have gotten over the most of it, but the one rooster still wheezes when he is excited or active. Is there anything else we can do? Should I give him more sulmet or tylan? Thanks!