they were coughing when we got them about 2 weeeks ago but the guy said he had already treated them.they are still coughing what do you suggest i give them i have duramycin-10 at my house or should i go get some tylan at tss.an how much should i give them there are 3 pheasants about 12 weeks old an a peacock about 18months old in the pen.thanks