1department of Veterinary Microbiology, College of Veterinary Science, Assam Agricultural University, Khanapara, Guwahati-781022, Assam
2Department of Veterinary Pathology, College of Veterinary Science, Assam Agricultural University, Khanapara, Guwahati-781022, Assam
*Corresponding author; e-mail: nayan_juti@yahoo.co.in
Eighteen hours broth culture of Pasteurella multocida (field isolate) containing 109 cells per ml was inoculated by intramuscularly in two age groups of ducks of 1–2 months and 5 months old at two different doses 0.25 ml and 0.5 ml.The experiment was repeated in 5 month old ducks with 1.0 ml and 1.5 ml of inoculum. The incubation period was 3–4 hours in young ducklings, while in 5 month old ducks, it was 6–8 hours. Clinical signs were similar in both young and adult with huddling, ruffled feathers, coughing, oculo-nasal discharge, diarrhea and death within 10–26 hours in ducklings and 26–41 hours in older ducks. There was progressive reduction of haemoglobin per cent, total erythrocyte count and leucocytosis with increase numbers of heterophil. Pathological changes comprised of haemorrhages, necrosis of liver and kidneys, serofibrinous pneumonia and catarrhal enteritis.
Duck, Haemorrhage, Heterophil, Pasteurellosis
