Question:  query regarding  some local chicken  showing the crackling sound  from neck with nasal discharge [ suspected to  be crd/ infactious bronchitis ]]
Answer:   ciprocolen  @ 1 gm / lits of water for 4-5 days , tetracycline powder @ 1 gm / lits of water for 3 days , segregrate the affected bird from the rest of the group .