EXPERIMENTAL PRODUCTION OF NECROTIC ENTERITIS IN BROILER CHICKENS

摘要

The present study was conducted to isolate and identify the Clostridium perfringens , the etiology of necrotic enteritis (NE) from broiler chickens and experimental production of NE with this isolate. A total of 50 samples were collected from jejunum of necropsied birds for isolation and identification of Cl. perfringens . Out of 50 samples, only 4 isolates of Cl . perfringens were isolated and identified (prevalence 8%). In experimental NE, the birds of group A (orally administered with only 0.1 ml (1x10 3 sporulated Eimeria acervulina oocysts/bird) showed dullness, ruffled feather, vent feather soiled with bloody faeces after 1 week of coccidial challenge. The birds of group B (orally administered 1x10 3 sporulated Eimeria acervulina oocysts/bird and 1 ml of 2 days old broth culture of Cl . perfringens ) showed severe depression, ruffled feathers, bloody faeces with fibrinous cast with 80% prevalence rate and 30% mortality in experimental NE. The birds of group C (orally inoculated with 1 ml of 2 days old broth culture of Cl. perfringens ) showed no striking clinical, gross and histopathological lesions. ?Postmortem changes in small intestine (duodenum) were congestion and haemorrhages specially for birds of group A. The most severe gross lesions comprised of ascites, enlarged liver and heart, intestinal distension, profuse haemorrhage, fibrinous cast, fragile intestinal wall and gas bubble formation in the small intestine (duodenum, jejunum and ileum) of birds of group B. Histologically, birds of group B showed hemorrhage and congestion in liver, heart and intestine, desquamation of intestinal epithelium and intense leukocytic infiltration in intestine, liver and heart. The findings obtained from this study showed that simultaneous coccidial infection enhanced the pathological lesions of NE. ? DOI = http://dx.doi.org/10.3329/bjvm.v9i1.11207 Bangl. J. Vet. Med. (2011). 9(1): 33?41