I have a 10 month old chicken and rooster that have taken sick. Labored breathing and congested sounds. I got tetracycline from my vet to treat respiratory but they don't seem like they are improving. Any suggestions? Additionally: The Hen is a ISA Brown and the Rooster is a RIR. The rooster shakes his head and eats some and drinks. The hen is not so I give her treated water with a syringe. I have to clean both nostrils out daily on both birds. I've also been rubbing some VETRX on the nostrils and comb. The gurgling sound doesn't seem to be improving either.